Based on a comment in #3434, we should do a better job of consistency in our XML comments.

We should do an audit and then add guidance in our contributor docs.

Side note - we should unify the way we display langwords in XML comments throughout the repository. Right now we have some displayed as plain text, some as inline markdown code (true), some as XML code blocks (<c>true</c>), some as XML langwords (langword="true").

Originally posted by @Sergio0694 in #3434 (comment)