Fixed typos in src/ciphers/chacha.rs

[0xprincedev]

This PR fixes typos in the file src/ciphers/chacha.rs

[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 95.44%. Comparing base (7c1542b) to head (818d95a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #943   +/-   ##
=======================================
  Coverage   95.44%   95.44%           
=======================================
  Files         332      332           
  Lines       21496    21496           
=======================================
  Hits        20516    20516           
  Misses        980      980           

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[github-actions[bot]]

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