usb/typec: fix kernel-doc notation warning for typec_match_altmode

Fix kernel-doc warning for missing function parameter 'mode' description:

../drivers/usb/typec/bus.c:268: warning: Function parameter or member 'mode' not described in 'typec_match_altmode'

Also fix typos for same function documentation.

Fixes: 8a37d87d ("usb: typec: Bus type for alternate modes")

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>