clarified ping module purpose

lib/ansible/modules/system/ping.py

@@ -23,19 +23,20 @@ DOCUMENTATION = '''
 ---
 module: ping
 version_added: historical
-short_description: Try to connect to host and return C(pong) on success.
+short_description: Try to connect to host, veryify a usable python and return C(pong) on success.
 description:
    - A trivial test module, this module always returns C(pong) on successful
      contact. It does not make sense in playbooks, but it is useful from
-     C(/usr/bin/ansible)
+     C(/usr/bin/ansible) to verify the ability to login and that a usable python is configured.
+   - This is NOT ICMP ping, this is just a trivial test module.
 options: {}
-author: 
+author:
     - "Ansible Core Team"
     - "Michael DeHaan"
 '''
 
 EXAMPLES = '''
-# Test 'webservers' status
+# Test we can logon to 'webservers' and execute python with json lib.
 ansible webservers -m ping
 '''