PEP 532, 577, 598: Fix footnotes references

[hugovk]

Fix footnote references: instead of [1_] should be of the form [1]_:

pep-0532.txt:886: WARNING: Footnote [1] is not referenced.
pep-0532.txt:889: WARNING: Footnote [2] is not referenced.
pep-0532.txt:892: WARNING: Footnote [3] is not referenced.
pep-0577.rst:806: WARNING: Footnote [1] is not referenced.
pep-0577.rst:809: WARNING: Footnote [2] is not referenced.
pep-0577.rst:812: WARNING: Footnote [3] is not referenced.
pep-0577.rst:815: WARNING: Footnote [4] is not referenced.
pep-0598.rst:885: WARNING: Footnote [1] is not referenced.
pep-0598.rst:888: WARNING: Footnote [2] is not referenced.
pep-0598.rst:891: WARNING: Footnote [3] is not referenced.

Also remove redundant emacs metadata, update a link redirect and fix a typo.

Preview

• https://pep-previews--2791.org.readthedocs.build/pep-0532/
• https://pep-previews--2791.org.readthedocs.build/pep-0577/
• https://pep-previews--2791.org.readthedocs.build/pep-0598/

[CAM-Gerlach]

LGTM, thanks @hugovk

[CAM-Gerlach]

LGTM, thanks @hugovk