USB example documentation not in hosted docs

[andrewxcav]

Thank you for submitting an SDK documentation issue. Please provide as much information you can.

System information

• OS: browser
• xcore board all
• SDK tag unknown

Describe the documentation issue
https://www.xmos.ai/documentation/XM-014660-PC-2/html/doc/tutorials/freertos/examples/index.html
lists several examples that correlate with the contents of /xcore_sdk/examples/freertos, however the example documentation for /xcore_sdk/examples/freertos/usb is absent.

Other information
"Getting started" also seems to fall under this category, but there's clearly a section for this in the docs at a higher level,