Clarify that /invite will respond with 200 if the user is already invited to the room (#1084)

* Clarify that /invite will respond with 200 if the user is already in the room

* Create 1084.clarification

* Update changelogs/client_server/newsfragments/1084.clarification

Co-authored-by: Travis Ralston <travpc@gmail.com>

changelogs/client_server/newsfragments/1084.clarification

@@ -0,0 +1 @@
+Mention that the `/rooms/{roomId}/invite` endpoint will return a 200 response if the user is already invited to the room.

data/api/client-server/inviting.yaml

@@ -80,7 +80,7 @@ paths:
             required: ["user_id"]
       responses:
         200:
-          description: The user has been invited to join the room.
+          description: The user has been invited to join the room, or was already invited to the room.
           examples:
             application/json: {
               }