Fix typos in Polish README

[jwilk]

CC: @pufereq

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.98%. Comparing base (225cb07) to head (4d82dad).
Report is 32 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3720      +/-   ##
==========================================
- Coverage   98.24%   97.98%   -0.27%     
==========================================
  Files          74       74              
  Lines        8105     8142      +37     
==========================================
+ Hits         7963     7978      +15     
- Misses        142      164      +22     

Flag	Coverage Δ
unittests	97.98% <ø> (-0.27%)	⬇️

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[willmcgugan]

Taking your word for it, thanks.