binder: modify the comment for binder_proc_unlock

Modify the comment for binder_proc_unlock() to clearly indicate which
spinlock it releases and to better match the acquire comment block
in binder_proc_lock().

Signed-off-by: Ba Jing <bajing@cmss.chinamobile.com>
Acked-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20240902052330.3115-1-bajing@cmss.chinamobile.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>