docs: fix a typo in formatdomain
docs: fix a typo in formatdomain

s/virual/virtual

Signed-off-by: Chen Hanxiao <818f8a165c25fa146ecad28e2ef3e3fb996fa364@cn.fujitsu.com>

crobinso/libvirt,andreabolognani/libvirt,agx/libvirt,nertpinx/libvirt,libvirt/libvirt,datto/libvirt,VenkatDatta/libvirt,taget/libvirt,nertpinx/libvirt,datto/libvirt,nertpinx/libvirt,nertpinx/libvirt,zippy2/libvirt,jardasgit/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,rlaager/libvirt,shugaoye/libvirt,shugaoye/libvirt,fabianfreyer/libvirt,elmarco/libvirt,libvirt/libvirt,agx/libvirt,zippy2/libvirt,rlaager/libvirt,elmarco/libvirt,jardasgit/libvirt,elmarco/libvirt,libvirt/libvirt,agx/libvirt,olafhering/libvirt,VenkatDatta/libvirt,elmarco/libvirt,jfehlig/libvirt,libvirt/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,agx/libvirt,taget/libvirt,fabianfreyer/libvirt,shugaoye/libvirt,eskultety/libvirt,eskultety/libvirt,crobinso/libvirt,zippy2/libvirt,datto/libvirt,taget/libvirt,jardasgit/libvirt,olafhering/libvirt,andreabolognani/libvirt,datto/libvirt,crobinso/libvirt,jardasgit/libvirt,eskultety/libvirt,shugaoye/libvirt,crobinso/libvirt,olafhering/libvirt,taget/libvirt,andreabolognani/libvirt,jfehlig/libvirt,datto/libvirt,rlaager/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,shugaoye/libvirt,rlaager/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,eskultety/libvirt,zippy2/libvirt,andreabolognani/libvirt,taget/libvirt,jardasgit/libvirt,olafhering/libvirt,elmarco/libvirt,rlaager/libvirt,agx/libvirt,andreabolognani/libvirt,eskultety/libvirt