DOC: Fix docstring title sections

[gueletk]

Changed "See also" section titles to "See Also" to fit with the new validator

• closes DOC: Fix docstring title sections #23640
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[pep8speaks]

Hello @gueletk! Thanks for submitting the PR.

• There are no PEP8 issues in the file pandas/core/accessor.py !

• There are no PEP8 issues in the file pandas/core/arrays/categorical.py !

• There are no PEP8 issues in the file pandas/core/arrays/datetimes.py !

• There are no PEP8 issues in the file pandas/core/arrays/period.py !

• There are no PEP8 issues in the file pandas/core/base.py !

• There are no PEP8 issues in the file pandas/core/frame.py !

• There are no PEP8 issues in the file pandas/core/generic.py !

• There are no PEP8 issues in the file pandas/core/groupby/generic.py !

• There are no PEP8 issues in the file pandas/core/groupby/groupby.py !

• There are no PEP8 issues in the file pandas/core/indexes/base.py !

• There are no PEP8 issues in the file pandas/core/indexes/datetimelike.py !

• There are no PEP8 issues in the file pandas/core/indexes/multi.py !

• There are no PEP8 issues in the file pandas/core/indexes/numeric.py !

• There are no PEP8 issues in the file pandas/core/indexes/range.py !

• There are no PEP8 issues in the file pandas/core/ops.py !

• There are no PEP8 issues in the file pandas/core/resample.py !

• There are no PEP8 issues in the file pandas/core/reshape/merge.py !

• There are no PEP8 issues in the file pandas/core/reshape/util.py !

• There are no PEP8 issues in the file pandas/core/series.py !

• There are no PEP8 issues in the file pandas/core/tools/datetimes.py !

• There are no PEP8 issues in the file pandas/core/tools/numeric.py !

• There are no PEP8 issues in the file pandas/core/tools/timedeltas.py !

• There are no PEP8 issues in the file pandas/core/window.py !

• There are no PEP8 issues in the file pandas/io/json/table_schema.py !

• There are no PEP8 issues in the file pandas/io/sql.py !

[datapythonista]

Nice work, thanks for it @gueletk, merging on green.

[codecov]

Codecov Report

Merging #23653 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #23653   +/-   ##
=======================================
  Coverage   92.24%   92.24%           
=======================================
  Files         161      161           
  Lines       51317    51317           
=======================================
  Hits        47338    47338           
  Misses       3979     3979

Flag	Coverage Δ
#multiple	90.63% <ø> (ø)	⬆️
#single	42.31% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/core/tools/numeric.py	100% <ø> (ø)	⬆️
pandas/io/json/table_schema.py	98.29% <ø> (ø)	⬆️
pandas/core/indexes/multi.py	95.46% <ø> (ø)	⬆️
pandas/core/base.py	97.61% <ø> (ø)	⬆️
pandas/core/tools/timedeltas.py	98.03% <ø> (ø)	⬆️
pandas/core/resample.py	96.99% <ø> (ø)	⬆️
pandas/core/arrays/datetimes.py	98.44% <ø> (ø)	⬆️
pandas/core/window.py	96.4% <ø> (ø)	⬆️
pandas/core/ops.py	94.25% <ø> (ø)	⬆️
pandas/core/arrays/categorical.py	95.34% <ø> (ø)	⬆️
... and 14 more

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