Update dgraph/self-managed/cloud-run.mdx

Co-authored-by: Copilot <[email protected]>

Author: johnymontana

dgraph/self-managed/cloud-run.mdx

@@ -179,7 +179,7 @@ Deploy Dgraph Alpha to Cloud Run:
 
 ```bash
 gcloud run deploy dgraph-cr \                                          
-  --image gcr.io/($PROJECT_ID)/dgraph-cr \
+  --image gcr.io/$PROJECT_ID/dgraph-cr \
   --platform managed \
   --region us-central1 \
   --allow-unauthenticated \