Rollup merge of #39314 - stjepang:rewrite-sort-header, r=brson

Rewrite the first sentence in slice::sort

For every method, the first sentence should consisely explain what it does,
not how. This sentence usually starts with a verb.

It's really weird for `sort` to be explained in terms of another function,
namely `sort_by`. There's no need for that because it's obvious how `sort`
sorts elements: there is `T: Ord`.

If `sort_by_key` does not have to explicitly state how it's implemented,
then `sort` doesn't either.

r? @steveklabnik

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