Update gcloud-deployment.md

Author: rohita77

docs/content/deployment/gcloud-deployment.md

@@ -28,16 +28,16 @@ The following are the instructions to deploy the angular-fullstack app to Google
 
     create a 'app.yaml' file with the following contents
 
-    ```json
-
+ ```javascript
+ 
     env: standard 
 
     runtime: nodejs8
 
     env_variables:
       MONGODB_URI:  "mongodb://<dbuser  :<dbpassword  @<environment_URI/deployment_name"
 
-    ```
+ ```
 
     ## Add app.yaml to .gitignore