Add the opt-in/out commands to metrics notice
Add the opt-in/out commands to metrics notice

Mentioning these commands make it easier for folks to get rid of the
large notice.

Bug: None
Change-Id: I85dd0e1ec0d33999af46f9e20b95bea05bd40a1e
Reviewed-on: https://chromium-review.googlesource.com/c/1330181
Auto-Submit: Peter Boström <835dd55d2edbcf18427bfaff167a5f261a98c2e0@chromium.org>
Commit-Queue: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>
Reviewed-by: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools