Apply suggestions from code review

Co-authored-by: Heitor Tashiro Sergent <[email protected]>

Author: yorugac

docs/sources/k6/next/set-up/set-up-distributed-k6/usage/extensions.md

@@ -62,9 +62,9 @@ Note that this examples overrides the default image with `k6-extended:latest`, a
 
 ## Troubleshooting
 
-If a `TestRun` with a custom image does not start the test and the k6 Operator [logs an error about the initializer](https://grafana.com/docs/k6/latest/set-up/set-up-distributed-k6/troubleshooting/#an-error-on-reading-output-of-the-initializer-pod), check the following command:
+If a `TestRun` with a custom image doesn't start the test and the k6 Operator [logs an error about the initializer](https://grafana.com/docs/k6/latest/set-up/set-up-distributed-k6/troubleshooting/#an-error-on-reading-output-of-the-initializer-pod), run the following command:
+
 ```sh
 docker run --entrypoint sh k6-extended:local -c "ls -l && k6 version"
-```
 
-This command should execute without an error.
+This command should execute without an error. If there's an error, resolve it by making sure that the `Dockerfile` is correctly configured. Use the sample above as a reference.