docs: Add setupFilesAfterEnv and jest.setTimeout example

[Acrontum-Carmichael]

Summary

The current docs did not efficiently explain setupTestFrameworkScriptFile was deprecated nor give a clear example of how to use.

Test plan

n/a as doc changes only

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[jeysal]

Thanks, makes sense to have an example there!

[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!

[jeysal]

Fixed the lint and copied changes to versioned docs, will now merge 👍 Thanks!

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