virsh: Be explicit that vol-resize is an offline operation.
virsh: Be explicit that vol-resize is an offline operation.

It is stated in the manual already, so let's mention the same thing in
the description to avoid causing problems.

Signed-off-by: Martin Kletzander <e82f23e74d43760279ebcc505dac4ae70d5627d0@redhat.com>

nertpinx/libvirt,nertpinx/libvirt,jardasgit/libvirt,jfehlig/libvirt,taget/libvirt,datto/libvirt,olafhering/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,libvirt/libvirt,jardasgit/libvirt,nertpinx/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,crobinso/libvirt,eskultety/libvirt,libvirt/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,taget/libvirt,datto/libvirt,taget/libvirt,datto/libvirt,olafhering/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,zippy2/libvirt,jfehlig/libvirt,eskultety/libvirt,jfehlig/libvirt,eskultety/libvirt,taget/libvirt,andreabolognani/libvirt,crobinso/libvirt,crobinso/libvirt,zippy2/libvirt,fabianfreyer/libvirt,olafhering/libvirt,eskultety/libvirt,libvirt/libvirt,eskultety/libvirt,andreabolognani/libvirt,zippy2/libvirt,crobinso/libvirt,datto/libvirt,datto/libvirt,taget/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,andreabolognani/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,andreabolognani/libvirt,libvirt/libvirt,zippy2/libvirt,fabianfreyer/libvirt,olafhering/libvirt