R1:c897dc04e5c4

Update DarkConsole documentation

Summary: This is a little bit out of date. Notably, the setting changed locations and we no longer have a "Config" tab since it's available in the config app.

Test Plan: Read documentation.

Reviewers: chad, skrul

Reviewed By: skrul

CC: aran

Differential Revision: https://secure.phabricator.com/D5415