[PATCH] doc: create manpage folders with right permissions

[Daniel Kahn Gillmor]

On Wed 2018-01-31 21:50:45 +0100, Antoine Amarilli wrote:
> Avoids the issue where umask can make man pages unreadable after
> installation. Relevant email on the mailing-list:
> <87h8rt30sy.fsf at fifthhorseman.net>

lgtm, and i've tagged to suggest that it's ready for inclusion.

thanks, Antoine!

      --dkg