docs: Fix simple typo, comparision -> comparison

[timgates42]

There is a small typo in flask_wtf/csrf.py.

Should read comparison rather than comparision.

[codecov-io]

Codecov Report

Merging #404 into master will increase coverage by 0.94%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #404      +/-   ##
==========================================
+ Coverage   98.73%   99.68%   +0.94%     
==========================================
  Files          18       18              
  Lines         949      949              
  Branches       74       74              
==========================================
+ Hits          937      946       +9     
+ Misses         12        3       -9     

Impacted Files	Coverage Δ
flask_wtf/csrf.py	98.10% <ø> (ø)
flask_wtf/form.py	100.00% <0.00%> (+2.73%)	⬆️
flask_wtf/i18n.py	100.00% <0.00%> (+7.14%)	⬆️
tests/test_i18n.py	100.00% <0.00%> (+10.00%)	⬆️

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