Propose new Code Review -1 text

New Code Review -1 default text has been proposed on a ML thread.
Propose it here so that we can "review" it. If we can agree this should
be updated as in this change a Gerrit admin will have to update
All-Projects directly then this change can be merged.

Fixes-bug: 1258899
Change-Id: I145d393bba6d7ebede7fbcd1f592937a9daadaf9
Merge "Propose new Code Review -1 text"