Doc: no mention of virtual memory in SiFive FU740-C000 Manual

Whereas the FU540-C000 Manual does mention virtual memory support, the FU740-C000 Manual has omitted this. It’d be useful to include it to minimize possible confusion.

That does seem strange that the U74 chapter has a section on PMP but not virtual memory. In the FU540 manual the E51 (now called S51) chapter has a section on PMP but the U54 doesn’t, with a section on virtual memory in its place.

This seems like an editing error.

The U74 manual itself does have a section on virtual memory before the section on PMP.

Thank you for pointing this out. We’ve notified our documentation team to get this corrected in a future release of the document.