Fix a minor grammar error in some docstrings.

[d-b-w]

Summary

Fix a minor grammar error in some docstrings.

it's means "it is". its is the possessive.

Test Plan

No plan, this is a docstring change that is neutral in line count.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.26%. Comparing base (52a5947) to head (e418a54).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1191   +/-   ##
=======================================
  Coverage   91.26%   91.26%           
=======================================
  Files         261      261           
  Lines       26898    26898           
=======================================
  Hits        24549    24549           
  Misses       2349     2349           

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