Update docs for jest-changed-files

[palmerj3]

Summary

Updates the docs for jest-changed-files package to match what is the main export.
Issue referenced here #4182

Test plan

No tests, just documentation updates.

[codecov-io]

Codecov Report

Merging #4190 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4190   +/-   ##
=======================================
  Coverage   60.25%   60.25%           
=======================================
  Files         198      198           
  Lines        6781     6781           
  Branches        6        6           
=======================================
  Hits         4086     4086           
  Misses       2692     2692           
  Partials        3        3

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[mjesun]

@palmerj3 thanks a lot for doing this! This is super nice! #facebooklovesyou #letsmergethat #fastfastfast

[github-actions]

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