Rollup merge of #64726 - andrewbanchich:unimplemented, r=rkruppe

rewrite documentation for unimplemented! to clarify use

The current docs for `unimplemented!` seem to miss the point of this macro.

> This can be useful if you are prototyping and are just looking to have your code type-check, or if you're implementing a trait that requires multiple methods, and you're only planning on using one of them.

You could also return a `()` if you just want your code to type-check.

I think `unimplemented!` is useful for when you want your program to exit when it reaches an unimplemented area.

I rewrote the explanation and gave examples of both forms of this macro that I think clarify its use a little better.

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