Merge pull request #20552 from github/repo-sync

repo sync

content/actions/creating-actions/creating-a-docker-container-action.md

@@ -60,7 +60,7 @@ Before you begin, you'll need to create a {% data variables.product.prodname_dot
 In your new `hello-world-docker-action` directory, create a new `Dockerfile` file. For more information, see "[Dockerfile support for {% data variables.product.prodname_actions %}](/actions/creating-actions/dockerfile-support-for-github-actions)."
 
 **Dockerfile**
-```dockerfile{:copy}
+```Dockerfile{:copy}
 # Container image that runs your code
 FROM alpine:3.10