As discussed before we selected win_environment to the documentation,
and point to win_uri for a more advanced module.
If we want to make this the reference module, we have to get this one
absolutely right in every possible way.
This PR cleans up both win_environment and win_uri, and makes the
required changes to the windows module development section.
* win_environment: Added tests and return info in document
* fixing up some yaml issues
* some more things I should have detected
* fixing up test tag name