Update docs/src/content/docs/guides/quickstart.mdx

Co-authored-by: Kazuhiro Sera <[email protected]>

Author: TimonBerlin

docs/src/content/docs/guides/quickstart.mdx

@@ -91,7 +91,7 @@ const historyFunFact = tool({
     properties: {},
     required: [],
     additionalProperties: false
-  }
+  },
   execute: async () => {
     // The output will be returned back to the Agent to use
     return 'Sharks are older than trees.';