watch_queue: rectify kernel-doc for init_watch()

The command './scripts/kernel-doc -none kernel/watch_queue.c'
reported a mismatch in the kernel-doc of init_watch().

Rectify the kernel-doc, such that no issues remain for watch_queue.c.
Signed-off-by: NLukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: NDavid Howells <dhowells@redhat.com>

kernel/watch_queue.c

@@ -413,7 +413,7 @@ static void put_watch(struct watch *watch)
 }
 
 /**
- * init_watch_queue - Initialise a watch
+ * init_watch - Initialise a watch
  * @watch: The watch to initialise.
  * @wqueue: The queue to assign.
  *