docs/envydis: Document envydis/envyas commandline settings fuc4op and fuc5op
docs/envydis: Document envydis/envyas commandline settings fuc4op and fuc5op

Can be set as optional ISA feature with '-F <feature>'.

Whilst most are auto-selected by '-V <variant>', they can also be specified manually.

envytools/envytools,envytools/envytools,envytools/envytools,envytools/envytools,envytools/envytools,karolherbst/envytools,karolherbst/envytools,karolherbst/envytools,karolherbst/envytools,karolherbst/envytools