Verify module docstrings are up to date.

[zahodi]

Module docstrings need to be revised:

• provide sufficient examples
• identify the parameter that is used identifying idempotency. Some modules look for a name and others have to check for a comment. Firewall modules are ensured based on their order and thus we use "order number" + "comment" to identify an item. Most module should have an idempotent parameter identified in the code and we just add that to the docstrings. Example: " idempotent_parameter = 'name'"