Updated, more open SiFive documentation licensing

To support more open and clear communication in the SiFive ecosystem, we’ve added a Creative Commons license to our public documentation, including things like the manual for the Freedom U740-C000 SoC, the chip that powers the SiFive HiFive Unmatched board, and the manual for the SiFive U74-MC Core IP that powers that SoC.

A shout out and thanks to all of you who shared your great feedback on our documentation.

We can’t wait to see what you’ll do next with our SiFive Core IP and development systems!