It is not relevant nowadays that *spicec* client was removed and even
monitors_config does not reach spice-vdagent in modern Guests.

Also add block quote for qemu cmdline and system's paths to make it
easier to copy-and-paste.

Signed-off-by: Victor Toso <victortoso@redhat.com>
Acked-by: Jakub Janků <jjanku@redhat.com>