Emphasize 'mock' variable name exception in docs

[jeffsee55]

The docs don't explicitly say that in the mockImplementation example const mockPlaySoundFile = jest.fn(); is relying on some behind-the-scenes magic. Not sure why but the explanation didn't click for me and it seems like I'm not the only one. This is an attempt to highlight this point

For reference: #2567 (comment)

[facebook-github-bot]

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. In order for us to review and merge your code, please sign up at https://code.facebook.com/cla. If you are contributing on behalf of someone else (eg your employer), the individual CLA may not be sufficient and your employer may need the corporate CLA signed.

If you have received this in error or have any questions, please contact us at [email protected]. Thanks!

[codecov-io]

Codecov Report

Merging #8182 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #8182   +/-   ##
=======================================
  Coverage   62.32%   62.32%           
=======================================
  Files         265      265           
  Lines       10469    10469           
  Branches     2545     2544    -1     
=======================================
  Hits         6525     6525           
  Misses       3361     3361           
  Partials      583      583

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f809c79...b78091d. Read the comment docs.

[thymikee]

Sounds good! Mind adding a changleog and update this part in versioned_docs as well? :)

[SimenB]

Thanks @jeffsee55! Could you sign the CLA so we can merge this? 🙂

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[jeffsee55]

Thanks for the formatting fix @SimenB. I'd put the wrong email down on my previous CLA, should be ok now

[SimenB]

Thanks!

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.
Please note this issue tracker is not a help forum. We recommend using StackOverflow or our discord channel for questions.