style: update comment in cd script

Author: Ji-soo708

.github/workflows/cd-backend.yml

@@ -38,7 +38,7 @@ jobs:
           docker images
           docker push ${{ secrets.DOCKER_USERNAME }}/${{ secrets.DOCKER_REPO }}
 
-      - name: Deploy to Prod WAS Server
+      - name: Deploy to Dev WAS Server
         uses: appleboy/ssh-action@master
         with:
           host: ${{ secrets.WAS_HOST }}