LXC: emphasis uid start of idmap only accept '0' in docs
LXC: emphasis uid start of idmap only accept '0' in docs

We don't accept any other values except '0'.

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

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