Documentation: Fix typo in proc_usb_info.txt

Correct typo "filsystem" to "filesystem" in
Documentation/usb/proc_usb_info.txt

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
1 file changed