REST API handbook contains incorrect links to Requests class

[rmccue]

Not sure where the code is that auto-links classes used in text, but for the REST API handbook, when Requests is used in the text (case-sensitively), it's linked to the Requests class.

This is most visible in the ​broken Requests section header on the handbook's homepage.

This code is in the DevHub_Formatting::autolink_references code, but is explicitly included there, so this seems intentional.

Since "requests" is both the name of the class and a common English word, IMO this should err on the most common case, which is as an English word. References to the class itself can be manually linked by the page author.

[coffee2code]

In 5595:

developer.wordpress.org: Prevent 'Requests' and 'Translations' from being treated as inline class references.

Unlike other class names, 'Requests' and 'Translations' have a decent chance of being used as actual words and not just inline class references, so err on the side of caution. If a class reference is intended for these two class names, the @see notation should be used, e.g. {@see Requests}.

Fixes #2842.