docs: Clarify CLI param testPathIgnorePatterns usage

[kevin-brotcke]

Summary

It took me way too long to figure out the correct way to pass multiple regexps as an array. Update the docs with more information and examples.

Also clarify the testPathIgnorePatterns param accepts either a string or an array.

Test plan

Ran examples I added to docs in my local environment.

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[codecov-io]

Codecov Report

Merging #11304 (2715487) into master (1be8d73) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #11304      +/-   ##
==========================================
- Coverage   64.19%   64.17%   -0.02%     
==========================================
  Files         308      308              
  Lines       13528    13528              
  Branches     3297     3297              
==========================================
- Hits         8684     8682       -2     
- Misses       4131     4132       +1     
- Partials      713      714       +1     

Impacted Files	Coverage Δ
packages/expect/src/utils.ts	94.83% <0.00%> (-1.30%)	⬇️

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[SimenB]

thanks! could you update the versioned docs as well?

[kevin-brotcke]

Thanks for reviewing. Done.

[SimenB]

thanks!

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