Minor documentation bug: license section numbering

[Aaaaaa 123456789]

Good evening,

I was reading the m4 documentation you have posted at
https://www.gnu.org/savannah-checkouts/gnu/m4/manual/m4-1.4.18/m4.html,
and I noticed that there's a very minor bug with the included copy of
the GPLv3 (in appendix A). The original GPLv3 text numbers its
sections starting from 0, but your copy uses 1-based numbering,
causing all cross-references to other sections to be off by one. (For
instance, "You may convey a covered work in object code form under the
terms of sections 4 and 5" at the beginning of the "Conveying
Non-Source Forms" section should actually reference sections 5 and 6
by your renumbering.)
The GFDL in appendix B also uses 1-based numbering, but I'm not
familiar with it enough to determine if there are any similar
off-by-one errors or not.

Please let me know if you need any further info.

Best regards