PEP 467: Fix footnotes (#2752)

* PEP 467: Convert orphaned references to bullets

* PEP 467: Update link redirects

Author: hugovk

pep-0467.txt

@@ -128,7 +128,7 @@ Python 2 ``str``) was as simple as::
 
    >>> str(123)
    '123'
-   
+
 With Python 3 that became the more verbose::
 
    >>> b'%d' % 123
@@ -236,18 +236,12 @@ of this PEP.
 References
 ==========
 
-.. [1] Initial March 2014 discussion thread on python-ideas
-   (https://mail.python.org/pipermail/python-ideas/2014-March/027295.html)
-.. [2] Guido's initial feedback in that thread
-   (https://mail.python.org/pipermail/python-ideas/2014-March/027376.html)
-.. [3] Issue proposing moving zero-initialised sequences to a dedicated API
-   (http://bugs.python.org/issue20895)
-.. [4] Issue proposing to use calloc() for zero-initialised binary sequences
-   (http://bugs.python.org/issue21644)
-.. [5] August 2014 discussion thread on python-dev
-   (https://mail.python.org/pipermail/python-ideas/2014-March/027295.html)
-.. [6] June 2016 discussion thread on python-dev
-   (https://mail.python.org/pipermail/python-dev/2016-June/144875.html)
+* `Initial March 2014 discussion thread on python-ideas <https://mail.python.org/pipermail/python-ideas/2014-March/027295.html>`_
+* `Guido's initial feedback in that thread <https://mail.python.org/pipermail/python-ideas/2014-March/027376.html>`_
+* `Issue proposing moving zero-initialised sequences to a dedicated API <https://github.com/python/cpython/issues/65094>`_
+* `Issue proposing to use calloc() for zero-initialised binary sequences <https://github.com/python/cpython/issues/65843>`_
+* `August 2014 discussion thread on python-dev <https://mail.python.org/pipermail/python-ideas/2014-March/027295.html>`_
+* `June 2016 discussion thread on python-dev <https://mail.python.org/pipermail/python-dev/2016-June/144875.html>`_
 
 
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