Cms: [FR] Give ability to include description of User Groups

[gdubois414]

Description

I think it would be extremely helpful to have editable descriptions of what a user group has permission to do. This would be for cases where new admins or users that can assign user groups can quickly understand what a given group has access to.

This would not be auto-generated, but rather an additional optional field in the user group settings page.

I think having a line similar to a field's instructions text, or as a tooltip next to the name would both be fine and not clutter the interface too much.

[darylknight]

+1. Would be great to be able to tell the users, and remind myself, what specific user groups are set up for.

[brandonkelly]

Just added this for 3.5!