Remove extra paren from example (#801)

The example code has an extra parenthesis

Author: coreyar

versioned_docs/version-5.x/deep-linking.md

@@ -73,7 +73,7 @@ function App() {
    const linking = {
 -    prefixes: ['https://app.example.com'],
 +    prefixes: ['https://app.example.com', 'exps://app.example.com'],
-   });
+   };
 ```
 
 ### Test deep linking on iOS