More doc warnings

[TomAugspurger]

No description provided.

[codecov]

Codecov Report

Merging #21808 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #21808   +/-   ##
=======================================
  Coverage   91.95%   91.95%           
=======================================
  Files         160      160           
  Lines       49858    49858           
=======================================
  Hits        45845    45845           
  Misses       4013     4013

Flag	Coverage Δ
#multiple	90.33% <100%> (ø)	⬆️
#single	42.08% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/core/strings.py	98.63% <100%> (ø)	⬆️

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[jreback]

thanks @TomAugspurger looks like still a couple of warnings, but reduced from before!