Listing rooms API doesn't make it clear it's only listing published rooms

[thibaultamartin]

Link to problem area: https://spec.matrix.org/v1.5/client-server-api/#get_matrixclientv3publicrooms

Issue

Description says

Lists the public rooms on the server.

This API returns paginated responses. The rooms are ordered by the number of joined members, with the largest rooms first.

A room can be public and not published to the server directory, in which case it won't be returned in this API. I would describe it as "Lists the rooms published on the server's room directory" instead.

[Johennes]

This was fixed with #2104.