USB: gadget: fix composite kernel-doc warnings

Warning(include/linux/usb/composite.h:284): No description found for parameter 'disconnect'
Warning(drivers/usb/gadget/composite.c:744): No description found for parameter 'c'
Warning(drivers/usb/gadget/composite.c:744): Excess function parameter 'cdev' description in 'usb_string_ids_n'

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/composite.c

@@ -723,12 +723,12 @@ int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str)
 
 /**
  * usb_string_ids_n() - allocate unused string IDs in batch
- * @cdev: the device whose string descriptor IDs are being allocated
+ * @c: the device whose string descriptor IDs are being allocated
  * @n: number of string IDs to allocate
  * Context: single threaded during gadget setup
  *
  * Returns the first requested ID.  This ID and next @n-1 IDs are now
- * valid IDs.  At least providind that @n is non zore because if it
+ * valid IDs.  At least provided that @n is non-zero because if it
  * is, returns last requested ID which is now very useful information.
  *
  * @usb_string_ids_n() is called from bind() callbacks to allocate

include/linux/usb/composite.h

@@ -247,6 +247,7 @@ int usb_add_config(struct usb_composite_dev *,
  *	value; it should return zero on successful initialization.
  * @unbind: Reverses @bind(); called as a side effect of unregistering
  *	this driver.
+ * @disconnect: optional driver disconnect method
  * @suspend: Notifies when the host stops sending USB traffic,
  *	after function notifications
  * @resume: Notifies configuration when the host restarts USB traffic,