[Libguestfs] Minor fix for xpath example

Hi The xpath example at https://libguestfs.org/virt-resize.1.html |virsh dumpxml guestname | xpath /domain/devices/disk/source| does not work anymore with recent xpath versions ? virsh dumpxml domain | xpath /domain/devices/disk/source Usage: /usr/bin/xpath [options] -e query [-e query...] [filename...] If no filenames are given, supply XML on STDIN. You must provide at least one query. Each supplementary query is done in order, the previous query giving the context of the next one. On Debian 12 and Fedora41 I need to add the -e switch to get the command working: virsh dumpxml domain | xpath -e /domain/devices/disk/source Found 1 nodes in stdin: -- NODE -- <source file="/var/lib/libvirt/images/debian11.qcow2" /> On both systems I have xpath 1.48 coming from libxml-xpath-perl.