workqueue: Fix a typo in workqueue.txt

This patch fixes a spelling typo in workqueue.txt
Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/workqueue.txt

@@ -169,7 +169,7 @@ resources, scheduled and executed.
   WQ_UNBOUND
 
 	Work items queued to an unbound wq are served by the special
-	woker-pools which host workers which are not bound to any
+	worker-pools which host workers which are not bound to any
 	specific CPU.  This makes the wq behave as a simple execution
 	context provider without concurrency management.  The unbound
 	worker-pools try to start execution of work items as soon as