Watch mode number of CPUs & documentation.

[scotthovestadt]

Summary

Revert change to number of CPUs and add docs to resolve @cpojer comment:
#8201 (comment)

Benchmarked Jest non-e2e test performance for this branch from 14.973s to 16.504s, which is still a massive win over the original 23.234s and probably points to further optimizations being possible since I'd hope that giving it 5 extra CPUs would do more for the performance.

Test plan

• All tests pass, including the test that specifically touches this number.

[cpojer]

Nice, thank you for changing this back and adding docs for it.

[cpojer]

"[…] not use all available CPUs."?

[codecov-io]

Codecov Report

Merging #8211 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #8211   +/-   ##
=======================================
  Coverage   62.31%   62.31%           
=======================================
  Files         265      265           
  Lines       10534    10534           
  Branches     2555     2556    +1     
=======================================
  Hits         6564     6564           
  Misses       3387     3387           
  Partials      583      583

Impacted Files	Coverage Δ
packages/jest-config/src/getMaxWorkers.ts	100% <100%> (ø)	⬆️

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[github-actions]

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