[chore] [exporterhelper] Update docs to remove requeuing

[carsonip]

Description:

• [chore] [exporterhelper] Update docs to remove requeuing as it was removed in [exporterhelper] Do not re-enqueue failed requests #9090
• Fix typo

There is no functional change and should not require a changelog.

[dmitryax]

Thanks @carsonip!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.90%. Comparing base (f471413) to head (a2e5b87).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9723   +/-   ##
=======================================
  Coverage   90.90%   90.90%           
=======================================
  Files         348      348           
  Lines       18374    18374           
=======================================
  Hits        16702    16702           
  Misses       1348     1348           
  Partials      324      324           

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