Silkscreen modifications
- Change "DIOT Distributed I/O Tier System Board" to "Distributed I/O Tier System Board"
- Add link to ohwr project "https://ohwr.org/project/diot-sb-zu"
- Change "Licensed under CERN-OHL-S v2 or later" to "Licensed under CERN-OHL-W v2 or later"
- Change "2020 v1.0" to "2021 v2.0"