cgroup: Fix documentation for cpu.idle

Two problems:
	- cpu.idle cgroups show up with 0 weight, correct the
	  documentation to indicate this.
	- cpu.idle has no entry describing it.

Signed-off-by: Josh Don <joshdon@google.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Josh Don 2023-11-30 16:52:03 -08:00 • committed by Tejun Heo
commit 7b91eb6000