Update "Deep Dive" in reusing-logic-with-custom-hooks.md with link and example of the use API

[aurorascharff]

I noticed that the "Deep Dive" in reusing-logic-with-custom-hooks.md about whether React will provide a built-in data fetching solution in the future contained information about a non-existent use API, which now exists. I updated the "Deep Dive" with a link and example of use and removed the comment stating it's not yet available.

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[aurorascharff]

@rickhanlonii I just committed your suggestion, thank you! Do you want anything else here? The use is already linked in the explanation.

[rickhanlonii]

Thanks!