Responses schema fixes (#3650)

Fixes #2237.

Corrects the response schemas for:

```
PUT /user/{user_id}/account_data/{account_dataType}
PUT /user/{user_id}/rooms/{roomId}/account_data/{type}
PUT /directory/list/room/{roomId}
PUT /sendToDevice/{eventType}/{txnId}
POST /account/3pid
POST /account/3pid/add
POST /account/3pid/bind
```

changelogs/client_server/newsfragments/3650.clarification

@@ -0,0 +1 @@
+Correct the schema for the responses  for various API endpoints.

data/api/client-server/account-data.yaml

@@ -67,6 +67,10 @@ paths:
         200:
           description:
             The account_data was successfully added.
+          examples:
+            application/json: {}
+          schema:
+            type: object
       tags:
         - User data
     get:
@@ -151,6 +155,10 @@ paths:
         200:
           description:
             The account_data was successfully added.
+          examples:
+            application/json: {}
+          schema:
+            type: object
       tags:
         - User data
     get:

data/api/client-server/administrative_contact.yaml

@@ -149,26 +149,26 @@ paths:
             application/json: {
               "submit_url": "https://example.org/path/to/submitToken"
             }
-            schema:
-              type: object
-              properties:
-                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 API's `POST
-                    /validate/email/submitToken` endpoint (without the requirement
-                    for an access token). The homeserver must send this token to the
-                    user (if applicable), who should then be prompted to provide it
-                    to the client.
+          schema:
+            type: object
+            properties:
+              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 API's `POST
+                  /validate/email/submitToken` endpoint (without the requirement
+                  for an access token). The homeserver must send this token to the
+                  user (if applicable), who should then be prompted to provide it
+                  to the client.
 
-                    If this field is not present, the client can assume that
-                    verification will happen without the client's involvement
-                    provided the homeserver advertises this specification version
-                    in the `/versions` response (ie: r0.5.0).
-                  example: "https://example.org/path/to/submitToken"
+                  If this field is not present, the client can assume that
+                  verification will happen without the client's involvement
+                  provided the homeserver advertises this specification version
+                  in the `/versions` response (ie: r0.5.0).
+                example: "https://example.org/path/to/submitToken"
         403:
           description: The credentials could not be verified with the identity server.
           examples:
@@ -223,8 +223,8 @@ paths:
           description: The addition was successful.
           examples:
             application/json: {}
-            schema:
-              type: object
+          schema:
+            type: object
         401:
           description: |-
             The homeserver requires additional authentication information.
@@ -282,8 +282,8 @@ paths:
           description: The addition was successful.
           examples:
             application/json: {}
-            schema:
-              type: object
+          schema:
+            type: object
         429:
           description: This request was rate-limited.
           schema:

data/api/client-server/key_backup.yaml

@@ -298,9 +298,10 @@ paths:
       responses:
         200:
           description: The update succeeded.
+          examples:
+            application/json: {}
           schema:
             type: object
-            properties: {}
         400:
           description: |-
             A parameter was incorrect.  For example, the `algorithm` does not

data/api/client-server/list_public_rooms.yaml

@@ -104,6 +104,8 @@ paths:
           description: The visibility was updated, or no change was needed.
           examples:
             application/json: {}
+          schema:
+            type: object
         404:
           description: The room is not known to the server
           examples:

data/api/client-server/to_device.yaml

@@ -85,7 +85,8 @@ paths:
           description:
             The message was successfully sent.
           examples:
-            application/json: {
-              }
+            application/json: {}
+          schema:
+            type: object
       tags:
         - Send-to-Device messaging