docs: Updated Testing Frameworks guide with React; make it generic

[ms314006]

Summary

Test plan

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Codecov Report

Merging #9106 into master will not change coverage.
The diff coverage is n/a.

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[jeysal]

Thanks! The paragraph at the top of that page still says that Jest may be considered React-specific, and that the page only lists other frameworks, which conflicts with your changes. But I think the top paragraph is not appropriate anymore.
Wdyt about changing that to a generic "here's some guides on how to use Jest with various web frameworks" and then just putting React there as the first framework in the list?

[thymikee]

Changed the guide to be more generic and used a link to a specific example of using RTL with Jest

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