docs: Fix formatting in the Swagger YAML file.

static/swagger/zulip.yaml

@@ -110,7 +110,6 @@ paths:
           description: Success.
           schema:
             $ref: '#/definitions/MessagesResponse'
-
     post:
       description: Send a message
       operationId: zerver.views.messages.send_message_backend
@@ -257,7 +256,6 @@ paths:
                      your client in your client code. For most applications, one
                      is only interested in messages, so one specifies:
                      `event_types=["message"]`
-
         required: false
         type: string
       - name: apply_markdown
@@ -367,7 +365,6 @@ paths:
                        * `twenty_four_hour_time`:
 
                        * `unsubscribed`:
-
           schema:
             $ref: '#/definitions/RegisterResponse'