fix: a typo (#7715)

Author: 0618

src/pages/[platform]/reference/amplify_outputs/index.mdx

@@ -37,7 +37,7 @@ You can also manually create this file for a specified Amplify app ID and branch
 
 ## Extending Amplify outputs file
 
-The `amplify_outputs.json` file is not just a static artifact; it iss designed to be extendable to suit the evolving needs of your application. By leveraging the `addOutput` method from your `backend`, you can programmatically add configurations. This is particularly useful for customizing outputs that are not directly exposed through the Amplify constructs or for dynamically adjusting your app's configuration in response to changes in your backend strategy.
+The `amplify_outputs.json` file is not just a static artifact; it is designed to be extendable to suit the evolving needs of your application. By leveraging the `addOutput` method from your `backend`, you can programmatically add configurations. This is particularly useful for customizing outputs that are not directly exposed through the Amplify constructs or for dynamically adjusting your app's configuration in response to changes in your backend strategy.
 
 <Callout warning>