mdoc DragonFly known version numbers

[Francis Gudin]

Hello,

the file src/gnu/usr.bin/groff/tmac/mdoc.local contains a list of
DragonFly version numbers that can be used within manual pages.

When using these to point a newly introduced feature or some other
important change that would be a good candidate for a HISTORY section in
a manual, do you think that refering to a Release is sufficient, thus
accepting to loose a bit of precision, or would you prefer that we
always try to be the most accurate by naming a Developpement tag ?

Any insight ?

Francis.