Rollup merge of #72829 - JOE1994:clarify_terms, r=jonas-schievink
Rollup merge of #72829 - JOE1994:clarify_terms, r=jonas-schievink

Clarify terms in doc comments

Doc comments of `copy_from_slice` say that people should use `clone_from_slice`
when 'src' doesn't implement `Copy`. However, 'src' is a reference and
it always implements `Copy`. The term 'src' should be fixed to `T`(element type of slice 'src') in
the doc comments.

Thank you for reviewing this PR :)  :smiley_cat:

aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust