chore: added filter to fix broken link (#7382)

Author: khatruong2009

src/fragments/lib-v1/graphqlapi/existing-resources.mdx

@@ -18,9 +18,27 @@ Existing AWS AppSync resources can be used with the Amplify Libraries by referen
 }
 ```
 
+<InlineFilter filters={
+    [
+        'ios',
+        'android',
+    ]
+}>
 - **API NAME**: Friendly name for the API (e.g., _api_)
   - **endpoint**: The HTTPS endpoint of the AWS AppSync API (e.g. `https://aaaaaaaaaaaaaaaaaaaaaaaaaa.appsync-api.us-east-1.amazonaws.com/graphql`). [Custom domain names](https://docs.aws.amazon.com/appsync/latest/devguide/custom-domain-name.html) can also be supplied here (e.g. `https://api.yourdomain.com/graphql`). Custom domain names can have any format, but must end with `/graphql` (see https://graphql.org/learn/serving-over-http/#uris-routes).
   - **region**: AWS Region where the resources are provisioned (e.g. _us-east-1_)
   - **authorizationType**: Authorization mode for accessing the API. This can be one of: `AMAZON_COGNITO_USER_POOLS`, `AWS_IAM`, `OPENID_CONNECT`, or `API_KEY`. Each mode requires additional configuration parameters. See [Configure authorization modes](/[platform]/prev/build-a-backend/graphqlapi/customize-authz-modes) for details.
+</InlineFilter>
+
+<InlineFilter filters={
+    [
+        'flutter',
+    ]
+}>
+- **API NAME**: Friendly name for the API (e.g., _api_)
+  - **endpoint**: The HTTPS endpoint of the AWS AppSync API (e.g. `https://aaaaaaaaaaaaaaaaaaaaaaaaaa.appsync-api.us-east-1.amazonaws.com/graphql`). [Custom domain names](https://docs.aws.amazon.com/appsync/latest/devguide/custom-domain-name.html) can also be supplied here (e.g. `https://api.yourdomain.com/graphql`). Custom domain names can have any format, but must end with `/graphql` (see https://graphql.org/learn/serving-over-http/#uris-routes).
+  - **region**: AWS Region where the resources are provisioned (e.g. _us-east-1_)
+  - **authorizationType**: Authorization mode for accessing the API. This can be one of: `AMAZON_COGNITO_USER_POOLS`, `AWS_IAM`, `OPENID_CONNECT`, or `API_KEY`. Each mode requires additional configuration parameters. See [Configure authorization modes](/[platform]/prev/build-a-backend/graphqlapi/customize-authorization-modes) for details.
+</InlineFilter>
 
 Note that before you can add an AWS resource to your application, the application must have the Amplify libraries installed. If you need to perform this step, see [Install Amplify Libraries](/[platform]/prev/start/project-setup/create-application/#n2-install-amplify-libraries).