Documentation link in description of User List macro points to wrong doc

The link is currently: https://docs.atlassian.com/confluence/docs-56/Userlister+Macro

The documentation is: https://confluence.atlassian.com/display/DOC/User+List+Macro

While we're here, it would also be good to improve the description itself. Currently the description is:

Displays a list of Confluence users based on group membership.

This doesn't convey the power of this macro - the ability to show users that are online.