bpo-33641: Convert RFC references into links. (GH-7103)


85% of them are already links.
(cherry picked from commit 0a36ac1a09587735237c5978ebd046313922869c)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
diff --git a/Doc/library/urllib.parse.rst b/Doc/library/urllib.parse.rst
index c0a388c..2d3488b 100644
--- a/Doc/library/urllib.parse.rst
+++ b/Doc/library/urllib.parse.rst
@@ -468,7 +468,7 @@
    *string* may be either a :class:`str` or a :class:`bytes`.
 
    .. versionchanged:: 3.7
-      Moved from RFC 2396 to RFC 3986 for quoting URL strings. "~" is now
+      Moved from :rfc:`2396` to :rfc:`3986` for quoting URL strings. "~" is now
       included in the set of reserved characters.
 
    The optional *encoding* and *errors* parameters specify how to deal with