documentation: fix typos in benchmark and auth docs

[eshitachandwani]

RELEASE NOTES: N/A

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.04%. Comparing base (8ab0c82) to head (ef83e7e).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8674      +/-   ##
==========================================
- Coverage   83.05%   83.04%   -0.02%     
==========================================
  Files         417      417              
  Lines       32310    32308       -2     
==========================================
- Hits        26835    26830       -5     
+ Misses       4091     4089       -2     
- Partials     1384     1389       +5     

see 21 files with indirect coverage changes

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