CLappin

This pull request fixes some of the minor issues spotted while evaluating Litex for Libero SoC 2023.02.0.8. Assumption made is that Libero SoC is installed as described [Libero_Installation_Licensing_Setup_User_Guide](https://coredocs.s3.amazonaws.com/Libero/2023_2/Tool/Libero_Installation_Licensing_Setup_User_Guide.pdf) Also add...

Broken Link to the RISC-V Privilege Level

3

Hi, Just noticed that the link to the RISC-V Privilege Level 1.9, 1.9.1, 1.10 specification in the Compatibility is broken. Thanks, Ciaran