docs: apply generics to typescript example

[tristan-f-r]

Closes #7854. Extracts generics along with the name to establish extra information when converting to typescript.

I would absolutely love a suggestion on this, as the current trick to un-indent the closing brace in generics is a bit hacky and may not work in different use cases.

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[dummdidumm]

Thank you! Did you encounter another occurence of generics in a /// file: snippet besides the one screenshotted in the issue? Because frankly, if they only look like this, we shouldn't worry about optimizing for every possible case right now

[tristan-f-r]

I couldn't find any other example of generics.

[Rich-Harris]

looks great — thanks so much!