Several Minor API / Reference Documentation Fixes

[bluss]

Several Minor API / Reference Documentation Fixes

• Fix a few small errors in the reference.
• Fix paper cuts in the API docs.

Fixes #24882
Fixes #25233
Fixes #25250

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @nikomatsakis (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. The way Github handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

Please see CONTRIBUTING.md for more information.

[bluss]

r? @steveklabnik

thanks!!

[steveklabnik]

This says it can't be merged. Can you rebase?

[bluss]

Rebased. Intelligently enough it conflicted with my own previous PR.

[steveklabnik]

@bors: r+ rollup

[bors]

📌 Commit aabdd8e has been approved by steveklabnik

[steveklabnik]

Thanks!

[frewsxcv]

Is it too late to get this backported?

[steveklabnik]

@frewsxcv i am backporting the entire book, reference, and grammar right before the release.

[frewsxcv]

👍