Fix a small typo in a doc comment.

[mkantor]

PR Type

Other

PR Checklist

Check your PR fulfills the following:

• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• A changelog entry has been made for the appropriate packages.
• Format code with the latest stable rustfmt

[codecov-commenter]

Codecov Report

Merging #1649 into master will decrease coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1649      +/-   ##
==========================================
- Coverage   53.17%   53.07%   -0.11%     
==========================================
  Files         127      122       -5     
  Lines       11809    11803       -6     
==========================================
- Hits         6280     6265      -15     
- Misses       5529     5538       +9     

Impacted Files	Coverage Δ
src/middleware/logger.rs	74.79% <ø> (ø)
src/handler.rs	88.23% <0.00%> (-1.97%)	⬇️
src/middleware/compress.rs	74.57% <0.00%> (-1.70%)	⬇️
src/middleware/defaultheaders.rs	83.87% <0.00%> (-1.62%)	⬇️
actix-http/src/h1/codec.rs	63.88% <0.00%> (-1.39%)	⬇️
actix-http/src/client/h1proto.rs	73.78% <0.00%> (-1.22%)	⬇️
src/types/readlines.rs	65.47% <0.00%> (-1.20%)	⬇️
actix-http/src/h1/client.rs	63.21% <0.00%> (-1.15%)	⬇️
actix-http/src/encoding/decoder.rs	82.17% <0.00%> (-1.00%)	⬇️
awc/src/sender.rs	25.00% <0.00%> (-0.90%)	⬇️
... and 12 more

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[robjtede]

Thanks 👍