bug#31694: man page copyright notice

[bill-auger]

i noticed the copyright in the sed man page has "Copyright ©2017 Free
Software Foundation, Inc."

according to GNU policy[1] it should list each year that some
modification was made

> "Don’t delete old year numbers, though; they are significant since
they indicate when older versions might theoretically go into the public
domain, if the movie companies don’t continue buying laws to further
extend copyright. If you copy a file into the package from some other
program, keep the copyright years that come with the file.
> You can use a range (‘2008-2010’) instead of listing individual years
(‘2008, 2009, 2010’) if and only if: 1) every year in the range,
inclusive, really is a “copyrightable” year that would be listed
individually; and 2) you make an explicit statement in a README file
about this usage."


[1]: https://www.gnu.org/prep/maintain/html_node/Copyright-Notices.html

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