Spell check

[Giftlin]

• closes #xxxx
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[codecov]

Codecov Report

Merging #21130 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #21130      +/-   ##
==========================================
- Coverage   91.83%   91.83%   -0.01%     
==========================================
  Files         153      153              
  Lines       49498    49498              
==========================================
- Hits        45458    45456       -2     
- Misses       4040     4042       +2

Flag	Coverage Δ
#multiple	90.23% <ø> (-0.01%)	⬇️
#single	41.88% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/core/base.py	96.83% <ø> (ø)	⬆️
pandas/util/testing.py	84.38% <0%> (-0.21%)	⬇️

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[jreback]

thanks!