update cluster delete doc

doc/cloud-platform_cluster_delete.md

@@ -11,10 +11,11 @@ It will delete the components, then the cluster, the VPC, terraform workspace an
 This command defaults to --dry-run=true, set --dry-run=false when you are ready to actually destroy the cluster.
 
 You must have the following environment variables set, or passed via arguments:
-	- a valid AWS profile or access key and secret.
-	- a valid auth0 client id and secret.
-	- a valid auth0 domain.
-	- a cluster name
+- a valid AWS profile or access key and secret
+- a valid AWS region
+- a valid auth0 client id and secret
+- a valid auth0 domain
+- a cluster name
 
 You must also be in the infrastructure repository, and have decrypted the repository before running this command.
 
@@ -29,8 +30,9 @@ cloud-platform cluster delete [flags]
       --auth0-client-id string       [required] auth0 client id to use
       --auth0-client-secret string   [required] auth0 client secret to use
       --auth0-domain string          [required] auth0 domain to use
-      --destroy-cluster              [optional] if true, will destroy the eks cluster (default true)
       --destroy-components           [optional] if true, will destroy the cluster components (default true)
+      --destroy-core                 [optional] if true, will destroy the cluster core layer (default true)
+      --destroy-cluster              [optional] if true, will destroy the eks cluster (default true)
       --destroy-vpc                  [optional] if true, will destroy the vpc (default true)
       --dry-run                      [optional] if false, the cluster will be destroyed otherwise no changes will be made to the cluster (default true)
   -h, --help                         help for delete