workqueue: clean up for_each_pwq()'s documentation

The if/else clause was removed with commit 5a6446626d7e
("workqueue: Convert for_each_wq to use built-in list check").

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Lai Jiangshan <jiangshanlai@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
1 file changed