Fixed typos in src/ciphers/salsa.rs

[0xprincedev]

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

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.44%. Comparing base (7c1542b) to head (84dc67e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #944   +/-   ##
=======================================
  Coverage   95.44%   95.44%           
=======================================
  Files         332      332           
  Lines       21496    21496           
=======================================
  Hits        20516    20516           
  Misses        980      980           

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