Fix some confusing wording and improve slice-search-related docs

This adds more links between `contains` and `binary_search` because I do think they have some relevant connections. If your (big) slice happens to be sorted and you know it, surely you should be using `[3; 100].binary_search(&5).is_ok()` over `[3; 100].contains(&5)`?
This also fixes the confusing "searches this sorted X" wording which just sounds really weird because it doesn't know whether it's actually sorted. It should be but it may not be. The new wording should make it clearer that you will probably want to sort it and in the same sentence it also mentions the related function `contains`.
Similarly, this mentions `binary_search` on `contains`' docs.
This also fixes some other minor stuff and inconsistencies.

Rollup of 6 pull requests

Successful merges:

 - rust-lang#90312 (Fix some confusing wording and improve slice-search-related docs)
 - rust-lang#96149 (Remove unused macro rules)
 - rust-lang#96279 (rustdoc: Remove .woff font files)
 - rust-lang#96355 (Better handle too many `#` recovery in raw str)
 - rust-lang#96379 (delay bug when adjusting `NeverToAny` twice during diagnostic code)
 - rust-lang#96384 (do not consider two extern types to be similar)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup