Updated docs

README-INVENTORY-FILE.md

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 ## Ansible Inventory Files
 Ansible provides rich semantics for inventory files. We leverage the 
-ansible model by applying a semantic convention that is based on the 
+Ansible model by applying a semantic convention that is based on the 
 Apigee Private Cloud domain model for referencing server nodes as 
-collections of planets and regions. This means that the normal Ansible 
-inventory files are used as is with the exception of the semantic 
-conventions for inventory group names. 
+collections of planets and regions. This means that Apigee semantics are used as group names 
+to ascribe roles to normal Ansible inventory files. Please refer to the (Ansible documentation)[http://docs.ansible.com/ansible/latest/user_guide/intro_inventory.html]
+for more inforamation on how this works.  
 
 ## Inventory File Conventions
 These roles depend on use of conventions in the inventory file.