Fixes link to the documentation

[cstuder]

Old link: http://docs.graylog.org/en/1.2/pages/users_roles.html New link: http://docs.graylog.org/en/1.2/pages/users_and_roles.html

[cstuder]

Alternatively you could rename the page here: https://github.com/Graylog2/documentation/blob/master/pages/users_and_roles.rst

[lennartkoopmann]

Oh no, this was my mistake when changing the docs, sorry. I will set up a proxy page in the docs next thing. Did not think about links in the web interface when renaming.

[joschi]

@cstuder Thanks! I've updated the link in the relevant branches.

[lennartkoopmann]

Fixed. Thanks!