[doc] add note explaining when jest.setTimeout should be called

[ftes]

Summary

Improve documentation of jest.setTimeout (so that consumers use it correctly, e.g. see #6557).

Test plan

None (documentation only).

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[thymikee]

Can you also update other versions files (22.x, 23.x) and master doc as well?

[codecov-io]

Codecov Report

Merging #6817 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6817   +/-   ##
=======================================
  Coverage   63.55%   63.55%           
=======================================
  Files         235      235           
  Lines        9030     9030           
  Branches        3        3           
=======================================
  Hits         5739     5739           
  Misses       3290     3290           
  Partials        1        1

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[ftes]

@thymikee done

[thymikee]

Can you also update the changelog pls? :)

[thymikee]

Thank you!

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