add hint for cluster configuration

arangodb/arangod.conf

@@ -1,6 +1,6 @@
-## 
+##
 ##  arangod.conf -- ArangoDB server configuration
-## 
+##
 
 [database]
 directory               = @l_prefix@/var/arangodb/db
@@ -34,3 +34,13 @@ level                   = info
 severity                = human
 file                    = @l_prefix@/var/arangodb/log/arangod.log
 
+# [cluster]
+# disable-dispatcher-kickstarter = yes
+# disable-dispatcher-frontend    = yes
+# data-path                      = @l_prefix@/lib/arangodb/cluster
+# log-path                       = @l_prefix@/var/arangodb/cluster
+# agent-path                     = @l_prefix@/sbin/etcd
+# arangod-path                   = @l_prefix@/sbin/arangod
+# dbserver-config                = @l_prefix@/etc/arangodb/arangod.conf
+# coordinator-config             = @l_prefix@/etc/arangodb/arangod.conf
+