docs: Update example useage comment (#23499)

----

### All Submissions:

* [y] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md)

### Adding new Construct Runtime Dependencies:

* [n] This PR adds new construct runtime dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md/#adding-construct-runtime-dependencies)

### New Features

* [n] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/main/INTEGRATION_TESTS.md)?
	* [n] Did you use `yarn integ` to deploy the infrastructure and generate the snapshot (i.e. `yarn integ` without `--dry-run`)?

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: jfgilmore

packages/@aws-cdk/aws-codepipeline-actions/lib/github/source-action.ts

@@ -65,7 +65,7 @@ export interface GitHubSourceActionProps extends codepipeline.CommonActionProps
    * It is recommended to use a Secrets Manager `Secret` to obtain the token:
    *
    *   const oauth = cdk.SecretValue.secretsManager('my-github-token');
-   *   new GitHubSource(this, 'GitHubAction', { oauthToken: oauth, ... });
+   *   new GitHubSourceAction(this, 'GitHubAction', { oauthToken: oauth, ... });
    *
    * If you rotate the value in the Secret, you must also change at least one property
    * of the CodePipeline to force CloudFormation to re-read the secret.