driver core: class: fix documentation for class_create()

In commit dcfbb67e48 ("driver core: class: use lock_class_key already
present in struct subsys_private") we removed the key parameter to the
function class_create() but forgot to remove it from the kerneldoc,
which causes a build warning.  Fix that up by removing the key parameter
from the documentation as it is now gone.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Fixes: dcfbb67e48 ("driver core: class: use lock_class_key already present in struct subsys_private")
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/20230327081828.1087364-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/class.c

@@ -223,7 +223,6 @@ static void class_create_release(struct class *cls)
 /**
  * class_create - create a struct class structure
  * @name: pointer to a string for the name of this class.
- * @key: the lock_class_key for this class; used by mutex lock debugging
  *
  * This is used to create a struct class pointer that can then be used
  * in calls to device_create().