[USB] Document composite device with IAD class/subclass/protocol #761
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Document that
DEVICE_CLASS=0xEF
,DEVICE_SUBCLASS=0x02
&DEVICE_PROTOCOL=0x01
is used to encode a composite device with IAD, since this is not obvious from reading the code.I can also update the
teensy3
implementation the same way if desired.Documentation: https://learn.microsoft.com/en-us/windows-hardware/drivers/usbcon/usb-interface-association-descriptor