[docs] changed react-testing-library package name to @testing-library/react

[jdelucaa]

Updated react-testing-library package name to @testing-library/react in docs.

Summary

react-testing-library package has been moved (testing-library/dom-testing-library#260) and for new versions @testing-library/react should be installed instead of react-testing-library.

Please let me know if you think it is necessary to change versioned docs as well.

Test plan

I installed react-testing-library in my local project and got the following message:

npm WARN deprecated react-testing-library@8.0.1: � react-testing-library has moved to @testing-library/react. Please uninstall react-testing-library and install @
testing-library/react instead, or use an older version of react-testing-library. Learn more about this change here: testing-library/dom-testing-library#260 Thanks! :)

Besides that, in this PR only documentation has been updated, no code breaking changes.

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[SimenB]

This will fail on node 6. Can you update the circle ci config to delete it on node 6 similar to the react native example?

(Ignore the circle failure on ci)

[SimenB]

Oh, these are just doc changes 😅 Could you update https://github.com/facebook/jest/tree/master/examples/react-testing-library as well? You run the example locally by doing yarn && yarn jest react-testing-library

And yes, please update the versioned docs 🙂

[jdelucaa]

@SimenB yes, just noticed the imports would need to be updated as well.. 😅
I'll do it.

[SimenB]

Thank you!

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