block: fix sysfs module parameters directory path in comment

The runtime configurable module parameter files are located under
/sys/module/MODULENAME/parameters, not /sys/module/MODULENAME.

Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/genhd.c

@@ -1969,7 +1969,7 @@ static const struct attribute *disk_events_attrs[] = {
  * The default polling interval can be specified by the kernel
  * parameter block.events_dfl_poll_msecs which defaults to 0
  * (disable).  This can also be modified runtime by writing to
- * /sys/module/block/events_dfl_poll_msecs.
+ * /sys/module/block/parameters/events_dfl_poll_msecs.
  */
 static int disk_events_set_dfl_poll_msecs(const char *val,
 					  const struct kernel_param *kp)