The `rustdoc.1` file has been added from https://github.com/rust-lang/rust/blob/a75e74df89230bc429a550e29d5c566de5f95deb/src/doc/man/rustdoc.1 under the following license:

```text
Short version for non-lawyers:

The Rust Project is dual-licensed under Apache 2.0 and MIT
terms.


Longer version:

Copyrights in the Rust project are retained by their contributors. No
copyright assignment is required to contribute to the Rust project.

Some files include explicit copyright notices and/or license notices.
For full authorship information, see the version control history or
https://thanks.rust-lang.org

Except as otherwise noted (below and/or in individual files), Rust is
licensed under the Apache License, Version 2.0 <LICENSE-APACHE> or
<http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
<LICENSE-MIT> or <http://opensource.org/licenses/MIT>, at your option.


The Rust Project includes packages written by third parties.
The following third party packages are included, and carry
their own copyright notices and license terms:

* LLVM. Code for this package is found in src/llvm-project.

    Copyright (c) 2003-2013 University of Illinois at
    Urbana-Champaign.  All rights reserved.

    Developed by:

        LLVM Team

        University of Illinois at Urbana-Champaign

        http://llvm.org

    Permission is hereby granted, free of charge, to any
    person obtaining a copy of this software and associated
    documentation files (the "Software"), to deal with the
    Software without restriction, including without
    limitation the rights to use, copy, modify, merge,
    publish, distribute, sublicense, and/or sell copies of
    the Software, and to permit persons to whom the Software
    is furnished to do so, subject to the following
    conditions:

        * Redistributions of source code must retain the
          above copyright notice, this list of conditions
          and the following disclaimers.

        * Redistributions in binary form must reproduce the
          above copyright notice, this list of conditions
          and the following disclaimers in the documentation
          and/or other materials provided with the
          distribution.

        * Neither the names of the LLVM Team, University of
          Illinois at Urbana-Champaign, nor the names of its
          contributors may be used to endorse or promote
          products derived from this Software without
          specific prior written permission.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
    ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
    TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
    PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT
    SHALL THE CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE
    FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
    ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
    OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
    OTHER DEALINGS WITH THE SOFTWARE.

* Additional libraries included in LLVM carry separate
  BSD-compatible licenses. See src/llvm-project/llvm/LICENSE.TXT
  for details.

* compiler-rt, in src/compiler-rt is dual licensed under
  LLVM's license and MIT:

    Copyright (c) 2009-2014 by the contributors listed in
    CREDITS.TXT

    All rights reserved.

    Developed by:

        LLVM Team

        University of Illinois at Urbana-Champaign

        http://llvm.org

    Permission is hereby granted, free of charge, to any
    person obtaining a copy of this software and associated
    documentation files (the "Software"), to deal with the
    Software without restriction, including without
    limitation the rights to use, copy, modify, merge,
    publish, distribute, sublicense, and/or sell copies of
    the Software, and to permit persons to whom the Software
    is furnished to do so, subject to the following
    conditions:

        * Redistributions of source code must retain the
          above copyright notice, this list of conditions
          and the following disclaimers.

        * Redistributions in binary form must reproduce the
          above copyright notice, this list of conditions
          and the following disclaimers in the documentation
          and/or other materials provided with the
          distribution.

        * Neither the names of the LLVM Team, University of
          Illinois at Urbana-Champaign, nor the names of its
          contributors may be used to endorse or promote
          products derived from this Software without
          specific prior written permission.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
    ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
    TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
    PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT
    SHALL THE CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE
    FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
    ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
    OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
    OTHER DEALINGS WITH THE SOFTWARE.

    ========================================================

    Copyright (c) 2009-2014 by the contributors listed in
    CREDITS.TXT

    Permission is hereby granted, free of charge, to any
    person obtaining a copy of this software and associated
    documentation files (the "Software"), to deal in the
    Software without restriction, including without
    limitation the rights to use, copy, modify, merge,
    publish, distribute, sublicense, and/or sell copies of
    the Software, and to permit persons to whom the Software
    is furnished to do so, subject to the following
    conditions:

    The above copyright notice and this permission notice
    shall be included in all copies or substantial portions
    of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
    ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
    TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
    PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
    SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
    OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
    IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.

* Portions of the FFI code for interacting with the native ABI
  is derived from the Clay programming language, which carries
  the following license.

    Copyright (C) 2008-2010 Tachyon Technologies.
    All rights reserved.

    Redistribution and use in source and binary forms, with
    or without modification, are permitted provided that the
    following conditions are met:

    1. Redistributions of source code must retain the above
       copyright notice, this list of conditions and the
       following disclaimer.

    2. Redistributions in binary form must reproduce the
       above copyright notice, this list of conditions and
       the following disclaimer in the documentation and/or
       other materials provided with the distribution.

    THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
    PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
    DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
    INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
    USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
    USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
    OF SUCH DAMAGE.

* libbacktrace, under src/libbacktrace:

    Copyright (C) 2012-2014 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.

    Redistribution and use in source and binary forms, with
    or without modification, are permitted provided that the
    following conditions are met:

        (1) Redistributions of source code must retain the
        above copyright notice, this list of conditions and
        the following disclaimer.

        (2) Redistributions in binary form must reproduce
        the above copyright notice, this list of conditions
        and the following disclaimer in the documentation
        and/or other materials provided with the
        distribution.

        (3) The name of the author may not be used to
        endorse or promote products derived from this
        software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
    ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
    AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
    NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
    INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
    USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
    USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
    OF SUCH DAMAGE.  */
```
