8305686126
improve `btree_cursors` functions documentation As suggested by ``@Amanieu`` (and others) in #107540 (https://github.com/rust-lang/rust/issues/107540#issuecomment-1937760547) Improvements: - Document exact behavior of `{upper/lower}_bound{,_mut}` with each of the three `Bound` types using unambigous words `{greatest,greater,smallest,smaller,before,after}`. - Added another doc-example for the `Bound::Unbounded` for each of the methods - Changed doc-example to use From<[T; N]> rather than lots of `insert()`s which requires a mutable map which clutters the example when `mut` may not be required for the method (such as for `{upper,lower}_bound`. - Removed `# Panics` section from `insert_{before,after}` methods since they were changed to return an error instead a while ago. - Reworded some phrases to be more consistent with the more regular `BTreeMap` methods such as calling entries "key-value" rather than "element"s.
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