docs: improve TypeScript Usage documentation with few additional notes

[mrazauskas]

Closes #13598

Summary

A couple of improvements based on user feedback from the above mentioned issue:

• currently the Getting Started guide is only telling to import from the @jest/globals package. The install step is missing. Let’s add it?
• both TypeScript Usage sections are missing the note that types will work only if imported from @jest/globals. The note is on top of the page. That is right place to have it, also it is easy to skip it. Perhaps it is useful to repeat the note?

Test plan

Deploy preview

[AndreasNasman]

Thanks, looks great! 👍
Not sure if needed, but a note about explicitly adding @jest/globals locks down the version or similar could maybe be helpful.

[mrazauskas]

Hm.. I think it is enough to document all necessary steps. Go this way and everything will work as expected.

Just above guide is suggesting to import babel-jest. From time to time users are suggesting to remove that line, because babel-jest ships with Jest anyways. Similar explanation would be useful there too. That’s why I feel like to keep it is fine to keep it simple.

[SimenB]

👍

[github-actions]

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