Backport source links from 3.x.

Existing links have been updated to use the new reST role.  In some
files, I have also made cosmetic changes to the header.
diff --git a/Doc/library/glob.rst b/Doc/library/glob.rst
index 1ef9a31..68cc9f0 100644
--- a/Doc/library/glob.rst
+++ b/Doc/library/glob.rst
@@ -1,4 +1,3 @@
-
 :mod:`glob` --- Unix style pathname pattern expansion
 =====================================================
 
@@ -8,6 +7,10 @@
 
 .. index:: single: filenames; pathname expansion
 
+**Source code:** :source:`Lib/glob.py`
+
+--------------
+
 The :mod:`glob` module finds all the pathnames matching a specified pattern
 according to the rules used by the Unix shell.  No tilde expansion is done, but
 ``*``, ``?``, and character ranges expressed with ``[]`` will be correctly
@@ -16,10 +19,6 @@
 subshell.  (For tilde and shell variable expansion, use
 :func:`os.path.expanduser` and :func:`os.path.expandvars`.)
 
-.. seealso::
-
-   Latest version of the `glob module Python source code
-   <http://svn.python.org/view/python/branches/release27-maint/Lib/glob.py?view=markup>`_
 
 .. function:: glob(pathname)