Change Markdown source file extension.

".md" files can be mistaken for GCC machine descriptions.  ".mdwn" is
what ikiwiki uses by default.  So let's avoid confusion and be
consistent with our wiki here.

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+Title: About this Manual
+
+
+Scope
+=====
+
+This manual describes certain legal and technical policy requirements that apply
+to all software included in this distribution.
+
+This manual does not describe practices for making source or binary packages.
+Nor does it describe any aspects of the operating system as a whole, including
+the filesystem hierarchy, system users, file modes, or service scripts.
+
+
+Rationale
+=========
+
+Legal Distribution
+------------------
+
+These requirements ensure that each package may be distributed individually or
+as part of a complete operating system, with or without charge, by anyone.  This
+means that hosts of package archive mirrors are legally allowed to distribute
+copies of the packages in the distribution.  It means that commercial vendors
+are legally allowed to distribute copies of this operating system, in whole or
+in part, in their products.  It also means that users who receive copies of this
+operating system or its packages are legally allowed to redistribute copies of
+the software they possess.
+
+Software Freedom
+----------------
+
+These requirements ensure that users and vendors have certain rights in the
+software they use and distribute.  Specifically, for each software package in
+the distribution, users and vendors have the right to use the software for any
+purpose, the right to study and modify the software, and the right to distribute
+copies – modified or unmodified – of the software.
+
+For more information on software freedom and the rights of users and
+distributors of free, libre, and open-source software, see the [Free Software
+Definition][].
+
+[Free Software Definition]: https://www.gnu.org/philosophy/free-sw.html
+
+Effective Support
+-----------------
+
+These requirements ensure that distribution maintainers are able to effectively
+support the software packages for which they are responsible.  Specifically,
+maintainers are able to study and modify their packages in order to support
+users and resolve technical issues in the software.