Add more information on PostgreSQL max_connections tuning

Author: crivetimihai

docs/docs/deployment/ibm-code-engine.md

@@ -307,7 +307,9 @@ ibmcloud cdb deployment-scaling-set mcpgw-db \
     --members 3 --memory-gb 16
 
 # Update the number of maximum connections:
-ibmcloud cdb deployment-configuration YOUR_DB_CRN '{"configuration":{"max_connections":215}}'    
+ibmcloud cdb deployment-configuration YOUR_DB_CRN '{"configuration":{"max_connections":215}}'
+
+# show max_connections;
 ```
 
 The gateway will reconnect transparently because the host name remains stable. See the [documentation for more details](https://cloud.ibm.com/docs/databases-for-postgresql?topic=databases-for-postgresql-managing-connections&locale=en#raise-connection-limit).