Don't mention that GET /_matrix/client/v3/profile/{userId} can return additional properties because this is true for almost every endpoint (#1910)

Signed-off-by: Johannes Marbach <n0-0ne+github@mailbox.org>

data/api/client-server/profile.yaml

@@ -195,8 +195,7 @@ paths:
       description: |-
         Get the combined profile information for this user. This API may be used
         to fetch the user's own profile information or other users; either
-        locally or on remote homeservers. This API may return keys which are not
-        limited to `displayname` or `avatar_url`.
+        locally or on remote homeservers.
       operationId: getUserProfile
       parameters:
         - in: path