Auto merge of #45152 - Binero:master, r=dtolnay

Addressed issues raised in #44286. (`OccupiedEntry::replace_entry`)

This commit renames the `replace` function to `replace_entry`, and
creates a seperate `replace_key` function for `OccupiedEntry`. The
original `replace` function did not solve the use-case where the
key needed to be replaced, but not the value. Documentation and
naming has also been updated to better reflect what the original
replace function does.

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