OpenAPI: use uri format

In avatar_url, pusher url, wellknown base_url, getUrlPreview, and submit_url.

Signed-off-by: Lukas Lihotzki <lukas@lihotzki.de>

data/api/client-server/definitions/public_rooms_response.yaml

@@ -68,6 +68,7 @@ properties:
             rules like any other user.
         avatar_url:
           type: string
+          format: uri
           description: The URL for the room's avatar, if one is set.
         join_rule:
           type: string
@@ -110,4 +111,4 @@ example: {
   "next_batch": "p190q",
   "prev_batch": "p1902",
   "total_room_count_estimate": 115
-}
+}

data/api/client-server/definitions/request_token_response.yaml

@@ -22,6 +22,7 @@ properties:
     example: "123abc"
   submit_url:
     type: string
+    format: uri
     description: |-
       An optional field containing a URL where the client must submit the
       validation token to, with identical parameters to the Identity Service

data/api/client-server/definitions/wellknown/homeserver.yaml

@@ -18,6 +18,7 @@ type: object
 properties:
   base_url:
     type: string
+    format: uri
     description: The base URL for the homeserver for client-server connections.
     example: https://matrix.example.com
 required:

data/api/client-server/definitions/wellknown/identity_server.yaml

@@ -18,6 +18,7 @@ type: object
 properties:
   base_url:
     type: string
+    format: uri
     description: The base URL for the identity server for client-server connections.
     example: https://identity.example.com
 required: