[TYPO] Datasheet: USB buffer control register

[shreeve]

It would be very helpful to inform the reader that this only works for device mode. I see that TinyUSB uses this even in host mode, but Table 395 shows that bit 12 is "DEVICE ONLY". If this is device only, it would be helpful to know that while reading the documentation itself and TinyUSB code should not set this bit (since it doesn't do anything). If it is for device mode AND host mode (which would be great!), the documentation should be fixed to remove the "DEVICE ONLY" in Table 395.