Improve `{BTreeMap,HashMap}::get_key_value` docs.
They are unusual methods. The docs don't really describe the cases when they might be useful (as opposed to just `get`), and the examples don't demonstrate the interesting cases at all.
This commit improves the docs and the examples.
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| benches | ||
| src | ||
| tests | ||
| build.rs | ||
| Cargo.toml | ||