[imorland]

Refs flarum/framework#5392

Changes proposed in this pull request:
The API page's Pagination section only covered paginate(). It now says what an Index endpoint without it does: it returns the whole list, but returns a real page with meta.page and links when the client asks for one (page[limit], page[offset], page[number]) or the endpoint sets limit().

Reviewers should focus on:

• This describes the behaviour of the fix for [2.x] Unpaginated, searcher-backed Index endpoints silently truncate at page[limit] framework#5392, so it should merge once that fix has been released.

Confirmed

• The description above is written by me and describes what this pull request actually does.