docs: fix link in getting started page

[apriliandi246]

fix link in documention (getting startted page). Change npm link to directly go to npm package for jest..

Summary

Test plan

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[SimenB]

makes sense to match the yarn link. Thanks!

[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!

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