R1:766ecf8d6b70

Update "Reporting Bugs" documentation for removal of free instances

Summary: I wrote "free" since "test" only give us 7 days to confirm the issue, but "free" no longer exists and "test" should be good enough.

Test Plan: o_O

Reviewers: chad

Reviewed By: chad

Differential Revision: https://secure.phabricator.com/D18423