Comment cloud providers private networks use cases

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>

docs/vars.md

@@ -67,6 +67,10 @@ following default cluster paramters:
 * *kube_hostpath_dynamic_provisioner* - Required for use of PetSets type in
   Kubernetes
 
+Note, if cloud providers have any use of the ``10.233.0.0/16``, like instances'
+private addresses, make sure to pick another values for ``kube_service_addresses``
+and ``kube_pods_subnet``, for example from the ``172.18.0.0/16``.
+
 #### DNS variables
 
 By default, dnsmasq gets set up with 8.8.8.8 as an upstream DNS server and all