Update content/actions/reference/workflow-syntax-for-github-actions.md

Co-authored-by: Martin Lopes <54248166+martin389@users.noreply.github.com>

Author: varunsridharan

content/actions/reference/workflow-syntax-for-github-actions.md

@@ -553,7 +553,7 @@ jobs:
   my_first_job:
     steps:
       - name: My first step
-        uses: docker://ghcr.io/cloud-builders/gradle
+        uses: docker://ghcr.io/OWNER/IMAGE_NAME
 ```
 
 ##### Example using a Docker public registry action