PEP 432: Fix footnotes and syntax highlighting

[hugovk]

Fixes these warnings:

pep-0432.txt:1381: WARNING: Footnote [1] is not referenced.
pep-0432.txt:1384: WARNING: Footnote [2] is not referenced.
pep-0432.txt:1387: WARNING: Footnote [3] is not referenced.
pep-0432.txt:1390: WARNING: Footnote [4] is not referenced.
pep-0432.txt:1393: WARNING: Footnote [5] is not referenced.
pep-0432.txt:1396: WARNING: Footnote [6] is not referenced.
pep-0432.txt:1399: WARNING: Footnote [7] is not referenced.
pep-0432.txt:1403: WARNING: Footnote [8] is not referenced.
pep-0432.txt:1406: WARNING: Footnote [9] is not referenced.
pep-0432.txt:1409: WARNING: Footnote [10] is not referenced.

Similar to #2714: the footnotes in the text should be of the form [1]_ not [1_].

• https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html#footnotes

Also, as the code blocks are mostly C, set the document default to C (re: PEP 12) instead of Python, with a couple of exceptions for bash/shell:

Before	After

Preview

https://pep-previews--2716.org.readthedocs.build/pep-0432/

[ericsnowcurrently]

Thanks for the fixes.

[CAM-Gerlach]

I think you meant console here (shell is an alias for bash, and this has the $ prompt and output as in console)

[hugovk]

Well spotted, I did!

Please see PR #2729 to fix it.