CL stands for change list. It's the unit of change that goes through code review (so for the context of that document I think the best translation to the git w

CL stands for change list. It's the unit of change that goes through code review (so for the context of that document I think the best translation to the git world is PR). Though it's not exactly a PR, a CL is also a single change in the change history (so you could also say that a CL is equivalent to a commit)