message: Update servicebus.json
  fixed "list" spelling
diff: "Subscriptions"
  ],
  "operationId": "Subscriptions_ListAll",
  - "description": "Lsit all the subscriptions under a specified topic.",
  + "description": "List all the subscriptions under a specified topic.",
  "externalDocs": {
  "url": "https://msdn.microsoft.com/en-us/library/azure/mt639400.aspx"
  },
  