[docs] fix inbox refresh response

Author: capcom6

app/src/main/assets/api/swagger.json

@@ -1745,13 +1745,6 @@
         },
         "responses": {
           "202": {
-            "content": {
-              "application/json": {
-                "schema": {
-                  "type": "object"
-                }
-              }
-            },
             "description": "Inbox refresh request accepted"
           },
           "400": {