tools: Fix virsh connect man page
tools: Fix virsh connect man page

The URI parameter is optional and xen:/// is not the default connection
URI.

Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

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