watchdog: Correct kerneldoc warnings

Correct kerneldoc syntax or drop kerneldoc entirely for function
comments not being kerneldoc to fix warnings like:

pretimeout_noop.c:19: warning: Function parameter or struct member 'wdd' not described in 'pretimeout_noop'

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/pcwd_usb.c

···
 	.notifier_call =	usb_pcwd_notify_sys,
 };
 
-/**
+/*
  *	usb_pcwd_delete
  */
 static inline void usb_pcwd_delete(struct usb_pcwd_private *usb_pcwd)
···
 	kfree(usb_pcwd);
 }
 
-/**
+/*
  *	usb_pcwd_probe
  *
  *	Called by the usb core when a new device is connected that it thinks
···
 }
 
 
-/**
+/*
  *	usb_pcwd_disconnect
  *
  *	Called by the usb core when the device is removed from the system.

drivers/watchdog/pretimeout_noop.c

···
 
 /**
  * pretimeout_noop - No operation on watchdog pretimeout event
- * @wdd - watchdog_device
+ * @wdd: watchdog_device
  *
  * This function prints a message about pretimeout to kernel log.
  */

drivers/watchdog/pretimeout_panic.c

···
 
 /**
  * pretimeout_panic - Panic on watchdog pretimeout event
- * @wdd - watchdog_device
+ * @wdd: watchdog_device
  *
  * Panic, watchdog has not been fed till pretimeout event.
  */

drivers/watchdog/wdt_pci.c

···
 	return 0;
 }
 
-/**
+/*
  *	wdtpci_get_temperature:
  *
  *	Reports the temperature in degrees Fahrenheit. The API is in