fix: alt image description

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: chriswblake

.github/steps/6-step.md

@@ -10,7 +10,7 @@ The only thing left to do is test it out!
 
 1. Monitor the **Actions** tab for the `Joke Action` workflow to complete:
 
-   <img width="400" alt="SCR-20251113-kntg" src="../images/joke-action-workflow-run.png" />
+   <img width="400" alt="Screenshot of the Joke Action workflow run showing a successful completion" src="../images/joke-action-workflow-run.png" />
 
 
 1. Return to the issue and you should see a new comment posted by `github-actions[bot]` containing a random dad joke!