a41ccf8 docs: Some general network install tweaks

Authored and Committed by jlinton 2 years ago
    docs: Some general network install tweaks
    
    First lets add an option for https booting since
    its well supported with the libvirt based virtualization
    solutions as well as aarch64 UEFI platforms.
    
    Then lets tweak the pxe documentation to refer to the IANA
    network boot types, document the aarc64 PXE options, as well
    as touching up the grub2 UEFI boot option so it works
    with current grub2s.
    
    Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>