docs: bhyve: document clock configuration
docs: bhyve: document clock configuration

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