Improve docs clearer for mongodb_user state - passwd vs password

The docs were unclear about which of password and passwd are used for the user, and which are used for the connection.

This makes the param names clearer and adds an example
Merge branch 'patch-2' of https://github.com/ashb/salt into ashb-patch-2
Merge branch 'ashb-patch-2' into develop
Fix lint

Also fix a bunch of bad grammar