Add possibility to manage nova enable_new_services param

Related-Prod: PROD-36787
Change-Id: I8d6a13d77c5248ef06aff46a2ee664dae0122af2
diff --git a/README.rst b/README.rst
index 59215b1..3333007 100644
--- a/README.rst
+++ b/README.rst
@@ -1421,6 +1421,16 @@
       compute:
         security_driver: apparmor
 
+Disable new services automatically
+========
+
+.. code-block:: yaml
+
+    nova:
+      compute:
+        enable_new_services: False
+      controller:
+        enable_new_services: False
 
 Change files/directories permissions for nova service:
 =======================================