update setupFiles documentation for improved clarity

[bambielli]

Summary

See #7174 for issue. setupFiles documentation was misleading. This PR makes it clearer that setupFiles are only expected to run once per test file, not once per test.

Test plan

N/A (documentation change)

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[thymikee]

Would you be so kind update versioned docs too? And add a changleog :)

[SimenB]

wrap in backtciks?

[bambielli]

oops sure.

[bambielli]

ack i thought I added the changelog... sorry!

[codecov-io]

Codecov Report

Merging #7187 into master will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7187      +/-   ##
==========================================
+ Coverage   67.22%   67.31%   +0.08%     
==========================================
  Files         248      248              
  Lines        9627     9615      -12     
  Branches        4        4              
==========================================
  Hits         6472     6472              
+ Misses       3154     3142      -12     
  Partials        1        1

Impacted Files	Coverage Δ
packages/jest-jasmine2/src/index.js	0% <0%> (ø)	⬆️
packages/jest-runtime/src/script_transformer.js	88.46% <0%> (ø)	⬆️

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[rickhanlonii]

LGTM!

[rickhanlonii]

Thanks @bambielli for your first Jest contribution 🎉

[bambielli]

Thank you! I <3 Jest, and am converting many of my coworkers over to it from Mocha/Chai/Sinon.
I'll look for more opportunities to contribute in the future.

[github-actions]

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