Edit guest.md, update qemu command to match qemu-kvm-9.1.0-12.el9s.tdx, and...

fanchen2requested to merge
fanchen2/docs:fanchen2-main-patch-53550 into main

Edit guest.md, update qemu command to match qemu-kvm-9.1.0-12.el9s.tdx, and console=hvc is not needed anymore because we update qemu command to use -serial stdio, and also add QGS support for libvirt XML.

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