media: siano: get rid of documentation warnings

The Siano driver doesn't use kernel-doc markups. While it
would be wanderful to convert to use it, it is probably
not worth the time.

So, instead of solving all problems there, just make
sure that it won't produce dozens of warnings.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/usb/siano/smsusb.c

@@ -74,7 +74,7 @@ struct smsusb_device_t {
 static int smsusb_submit_urb(struct smsusb_device_t *dev,
 			     struct smsusb_urb_t *surb);
 
-/**
+/*
  * Completing URB's callback handler - bottom half (proccess context)
  * submits the URB prepared on smsusb_onresponse()
  */
@@ -86,7 +86,7 @@ static void do_submit_urb(struct work_struct *work)
 	smsusb_submit_urb(dev, surb);
 }
 
-/**
+/*
  * Completing URB's callback handler - top half (interrupt context)
  * adds completing sms urb to the global surbs list and activtes the worker
  * thread the surb