[DOC] CLIC interrupt section is missing exception code and NMI priority info

Created by: Silabs-ArjanB

The relative priority of CLIC interrupts and NMIs and the exception codes when using CLIC are not explained well. Much of the equivalent content that is explained for CLINT ( https://docs.openhwgroup.org/projects/cv32e40x-user-manual/en/latest/exceptions_interrupts.html#interrupts) is missing from the CLIC interrupt section (https://docs.openhwgroup.org/projects/cv32e40x-user-manual/en/latest/exceptions_interrupts.html#id7)