Make it clearer that string refs are considered legacy #6692
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Anecdotally, it's my impression that most people aren't aware that string refs are considered legacy. The docs mention it, but it's easy to miss. As an example, I brought this up on Twitter and @ryanflorence (whom no one can accuse of being a React newbie) noted that he hadn't bothered to look into callback refs yet.
This PR places the legacy warning in a stylized "Note" box, like similar warnings throughout the docs.
It might also be nice to link to a resource (perhaps a blog post?) that explains the disadvantages of string refs, but the only one I'm aware of is this old GitHub issue.