workqueue: Comment correction in file header

No functional change. There are two worker pools for each cpu in
current implementation (one for normal work items and the other for
high priority ones).

tj: Whitespace adjustments.
Signed-off-by: NLibin <huawei.libin@huawei.com>
Signed-off-by: NTejun Heo <tj@kernel.org>

kernel/workqueue.c

@@ -16,9 +16,10 @@
  *
  * This is the generic async execution mechanism.  Work items as are
  * executed in process context.  The worker pool is shared and
- * automatically managed.  There is one worker pool for each CPU and
- * one extra for works which are better served by workers which are
- * not bound to any specific CPU.
+ * automatically managed.  There are two worker pools for each CPU (one for
+ * normal work items and the other for high priority ones) and some extra
+ * pools for workqueues which are not bound to any specific CPU - the
+ * number of these backing pools is dynamic.
  *
  * Please read Documentation/workqueue.txt for details.
  */