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`{BTree,Hash}Map`: add "`Entry` API" section heading
I wanted to link to an introduction of the `Entry` API to the help message of `clippy::map_entry` (see https://github.com/rust-lang/rust-clippy/issues/11598 for motivation), but I found the documentation on the `Entry` enum itself a bit short. On the other hand, `{BTree,Hash}Map` both have sections in their docs introducing the whole API and giving usage examples, and so I would like to link to that instead. For that, I introduce the "`Entry` API" section heading to both of them.
Do let me know whether you think this is the right approach.