docs(code-review): trigger /github-pr-review alongside /codereview in Option B automation prompt (OpenHands#553)

Co-authored-by: openhands <openhands@all-hands.dev>

Author: all-hands-bot

openhands/usage/use-cases/code-review.mdx

@@ -468,7 +468,7 @@ Step 3 — Post a progress comment and save the comment ID:
     -d "{\"body\": \"🔍 **Review in progress…**\\n\\nWe are performing the review through OpenHands Cloud Automation. You can log in and [view the conversation here](${SESSION_URL}).\"}" \
     | python3 -c "import sys,json; print(json.load(sys.stdin)['id'])")
 
-Step 4 — /codereview
+Step 4 — /codereview and /github-pr-review
 Review the pull request using the pr-review plugin. Post a comprehensive code review on GitHub with inline comments on specific changed lines where appropriate, and a concise overall summary. Avoid duplicating existing unresolved review comments.
 
 When submitting the review, choose the appropriate event type: