[docs] Base ClickAwayListener style revisions and final review

[samuelsycamore]

This PR reviews the ClickAwayListener doc. I've done some style editing, and also elaborated on parts of the text that were a bit sparse. I have a couple questions about the content that I will ask as comments on the doc.

[mui-bot]

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Generated by 🚫 dangerJS against 3d29e61

[michaldudak]

I found two minor issues. Besides that it looks good!

[oliviertassinari]

This title was on purpose for SEO. See https://stackoverflow.com/questions/32553158/detect-click-outside-react-component for why. Sure it might not be for the title but we still need to rank for this search intent:

I have updated https://stackoverflow.com/a/59913572/2801714 to point to the latest URL.

[samuelsycamore]

We can revert this title in the final pass of the Base docs. I'll make a note of it.

[oliviertassinari]

As a general note, it can be great to search for other instances of the problem in the codebase. It's not rare to have the problem not isolated e.g. #33813 😁.