Update bug triage instructions

The Gerrit issues have been migrated from Monorail into the Gerrit
Tracker. Things are a bit different in the new Gerrit Tracker which is
why the instructions need to be updated:

* The issue type is a field, not a label.
* The set of possible issue statuses is different and statuses are named
  differently.
* Labels have been replaced by hotlists.
* The visibility of security issues is limited by moving them to the
  Security component.

Change-Id: I534a0748d9fbdbb979a462c8c1671749c68f3dfc
Signed-off-by: Edwin Kempin <ekempin@google.com>
1 file changed