Add basic cluster health check to runtime deployment guide

Also, make BGP peer IP range and address more clear and
add more description about fleet workspace assignment

Change-Id: Ia0ab6a27762d86b388c2267251dfd7e7d11c850b
diff --git a/edge_deployment/vpn_bootstrap.rst b/edge_deployment/vpn_bootstrap.rst
index 7c57367..28133f1 100644
--- a/edge_deployment/vpn_bootstrap.rst
+++ b/edge_deployment/vpn_bootstrap.rst
@@ -213,7 +213,8 @@
    }
 
 .. note::
-   Unless you have a specific requirement, set ASN and BGP addresses to the next available values in the map.
+   Unless you have a specific requirement, set ASN to the next available value in the map.
+   For BGP peer IP range and address, use the next available /30 subnet in the map.
 
 
 Create Terraform and Ansible configurations