chore(docs): getting started guide - cleanup (#3361)

Add a cleanup step to our getting started guide by running `terraform destroy`.

## Checklist

- [ ] Title matches [Winglang's style guide](https://www.winglang.io/contributing/start-here/pull_requests#how-are-pull-request-titles-formatted)
- [ ] Description explains motivation and solution
- [ ] Tests added (always)
- [ ] Docs updated (only required for features)
- [ ] Added `pr/e2e-full` label if this feature requires end-to-end testing

*By submitting this pull request, I confirm that my contribution is made under the terms of the [Monada Contribution License](https://www.winglang.io/terms-and-policies/contribution-license.html)*.

docs/docs/01-start-here/05-aws.md

@@ -122,3 +122,11 @@ through the AWS Management Console.
 8. Cycle through the buckets until you find one that contains `wing.txt`.
 9. Click `wing.txt` then click the `Open` button.
 10. The file should contain `Hello, cloud`.
+
+## Cleanup
+
+Once you're done, you can destroy all of the resources that were created on your AWS account by running:
+
+```sh
+terraform destroy
+```