We have a few places in the documentation where we document an

apply_to setting. The static media page documents several pre-defined

URL names or lists of names, and other places either link to this or

just ignore that there's a list at all. Another page will soon need

this.
These URL names have been moved into a dedicated page, and extended out

a little bit (but more work would be valuable here). All references to

apply_to now point to this page (with the exception of ActionHook,

which is getting a rewrite that will incorporate it).

Built the docs. Checked the links, and checked for any obvious errors.