PEP 554: Convert unreferenced footnote to bullet point (#3189)

Author: hugovk

pep-0554.rst

@@ -1332,10 +1332,6 @@ References
 .. [caveats]
    https://docs.python.org/3/c-api/init.html#bugs-and-caveats
 
-.. [petr-c-ext]
-   https://mail.python.org/pipermail/import-sig/2016-June/001062.html
-   https://mail.python.org/pipermail/python-ideas/2016-April/039748.html
-
 .. [cryptography]
    https://github.com/pyca/cryptography/issues/2299
 
@@ -1384,18 +1380,11 @@ References
     https://mail.python.org/pipermail/python-ideas/2017-September/047144.html
     https://mail.python.org/pipermail/python-dev/2017-September/149566.html
 
+* petr-c-ext
+    https://mail.python.org/pipermail/import-sig/2016-June/001062.html
+    https://mail.python.org/pipermail/python-ideas/2016-April/039748.html
+
 Copyright
 =========
 
 This document has been placed in the public domain.
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