Fix documentation typos

[MapleCCC]

No description provided.

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[zsol]

Thanks for contributing!

[codecov-commenter]

Codecov Report

Merging #527 (8663b3d) into main (71b8002) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #527   +/-   ##
=======================================
  Coverage   94.77%   94.77%           
=======================================
  Files         235      236    +1     
  Lines       23137    23143    +6     
=======================================
+ Hits        21928    21934    +6     
  Misses       1209     1209           

Impacted Files	Coverage Δ
libcst/matchers/_matcher_base.py	90.97% <ø> (ø)
setup.py	100.00% <0.00%> (ø)

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