apps: updated description on scaling best practices

docker-compose-apps.yaml

@@ -103,6 +103,7 b' services:'
 #      - database
     deploy:
       # override this in .custom/docker-compose-apps.override.yaml to scale up
+      # replicas of rhodecode and vcsserver should be equal in most cases
       replicas: 1
 #    ports:
 #      - "127.0.0.1::10020"
@@ -133,6 +134,7 b' services:'
     ]
     deploy:
       # override this in .custom/docker-compose-apps.override.yaml to scale up
+      # replicas of rhodecode and vcsserver should be equal in most cases
       replicas: 1
     environment:
       RC_APP_TYPE: rhodecode_vcsserver