feature: Backlinks

[pawamoy]

Is your feature request related to a problem? Please describe.

I'm having fun looking at matrix-nio's API, and also having trouble finding how to get the details of a room.

I resorted to searching for "room name" into the big HTML page, and ended up on this class: https://matrix-nio.readthedocs.io/en/latest/nio.html#nio.rooms.MatrixRoom, which seems to provide the info I want.

However I don't how I'm supposed to get back instances of this class (client.joined_rooms only returns a list of room ids as strings).

So I thought, "would be nice if there were links in this class docs showing me what functions/methods return instances of it". Backlinks!

Describe the solution you'd like

A way to display backlinks in the rendered docs:

• For a class: which functions/methods return instances of it.
• For anything: which functions/methods uses it. Not possible yet as we don't scan function bodies.
• ?

Describe alternatives you've considered

Manual backlinks?

Additional context

This will probably need changes in Griffe.

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