updated better yaml host examples

examples/hosts.yaml

@@ -4,15 +4,16 @@
 #
 #   - Comments begin with the '#' character
 #   - Blank lines are ignored
-#   - Top level entries are assumed to be groups
+#   - Top level entries are assumed to be groups, start with 'all' to have a full hierchy
 #   - Hosts must be specified in a group's hosts:
 #     and they must be a key (: terminated)
 #   - groups can have children, hosts and vars keys
 #   - Anything defined under a hosts is assumed to be a var
 #   - You can enter hostnames or ip addresses
 #   - A hostname/ip can be a member of multiple groups
-# Ex 1: Ungrouped hosts, put in 'ungrouped' group
-##ungrouped:
+
+# Ex 1: Ungrouped hosts, put in 'all' or 'ungrouped' group
+##all:
 ##  hosts:
 ##      green.example.com:
 ##          ansible_ssh_host: 191.168.100.32
@@ -21,7 +22,7 @@
 ##      192.168.100.10:
 
 # Ex 2: A collection of hosts belonging to the 'webservers' group
-
+##  children:
 ##    webservers:
 ##      hosts:
 ##        alpha.example.org:
@@ -41,3 +42,9 @@
 ##        webservers:
 ##            hosts:
 ##                beta.example.org:
+
+# Ex 4: all vars
+# keeping withing 'all' group you can define common 'all' vars here with lowest precedence
+
+##  vars:
+##      commontoall: thisvar