/usr/share/doc/sed/AUTHORS is in sed 4.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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GNU Sed was first authored by Jay Fenlason (firstname.lastname@example.org) and later modified by Tom Lord (email@example.com). Ken Pizzini (firstname.lastname@example.org) and Paolo Bonzini (email@example.com) took over and maintained it for many years. GNU Sed is currently being maintained by Jim Meyering (firstname.lastname@example.org) and Assaf Gordon (email@example.com).