Deprecated link to usb.org in adafruit_hid documentation

[jpecor]

There's a link to usb.org in the adafruit_hid.keycode.Keycode section of the documentation:

http://www.usb.org/developers/hidpage/Hut1_12v2.pdf#page=58

This link appears to be deprecated and leads to a Page Not Found error. I did some traversing around usb.org and found the Hut1_12v2.pdf document here:

https://www.usb.org/sites/default/files/documents/hut1_12v2.pdf

But I don't know for sure if that is the intended reference.

[tannewt]

@jpecor I imagine that is the correct document. Mind creating a PR to update it?

Will transfer this to the adafruit_hid repo now since that's where the PR will need to be.

[jpecor]

@tannewt - Yes, I'm happy to create a PR. Though, I don't know where to find the source for the readthedocs.io document.

[dhalbert]

The RTD doc is generated from inline documentation in the code. The obsolete link is here: https://github.com/adafruit/Adafruit_CircuitPython_HID/blob/master/adafruit_hid/keycode.py#L35. Thanks!

[tannewt]

Fixed by #33. Thanks @jpecor