xen-doc 4.17.0+24-g2f8851c37f-2 (armhf binary) in ubuntu lunar

 Documentation for the Xen hypervisor and surrounding software,
 including descriptions of the hypercall interfaces and of some
 of the library APIs.
 .
 You do not need this package for the primary manpages for the
 Xen control utilities, as those are in the xen-utils-common package.