Merge pull request #757 from kwoodson/extravars

Updating example for multi inventory.

inventory/multi_ec2.yaml.example

@@ -18,7 +18,7 @@ accounts:
       AWS_ACCESS_KEY_ID: XXXXXXXXXXXXXXXXXXXX
       AWS_SECRET_ACCESS_KEY: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
     all_group: ec2
-    hostvars:
+    extra_vars:
       cloud: aws
       account: aws1