doc: usb: Fix typo in Documentation/usb/gadget_configs.txt

Correct spelling typo in Documentation/usb/gadget_configs.txt

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
1 file changed