DEPR: removed long deprecated input param 'axis' in .replace()

[math-and-data]

• closes additional request in PR DOC: update the pandas.DataFrame.replace docstring #20271
• passes git diff upstream/master -u -- "*.py" | flake8 --diff

[codecov]

Codecov Report

Merging #20789 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #20789      +/-   ##
==========================================
+ Coverage   91.79%    91.8%   +<.01%     
==========================================
  Files         153      153              
  Lines       49411    49409       -2     
==========================================
+ Hits        45359    45360       +1     
+ Misses       4052     4049       -3

Flag	Coverage Δ
#multiple	90.2% <ø> (ø)	⬆️
#single	41.91% <ø> (-0.01%)	⬇️

Impacted Files	Coverage Δ
pandas/core/generic.py	95.98% <ø> (+0.04%)	⬆️
pandas/core/frame.py	97.13% <ø> (ø)	⬆️
pandas/core/series.py	94.03% <ø> (ø)	⬆️
pandas/util/testing.py	84.59% <0%> (+0.2%)	⬆️

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[jreback]

thanks @math-and-data