mdoc(7) update

[Sascha Wildner]

Francis GUDIN wrote:
Hello,

here's an update to mdoc(7): it now describes 'our' macro (Dx) and adds
a few new 'known' versions of DragonFly to mdoc.local.
The patch is generated from "hg export"; feel free to let me know if
it's an issue.
Thanks go to Sascha for his explanations regarding contrib/ and patches!
One more thing, the final version of the patch should maybe be submitted 
to the groff people so the documentation can be included in groff.

Sascha

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