Update Ansible to the latest upstream release
see next comment
The docs option for the makefile is currently broken in both stable and development branches/releases, with the manpages being removed from them as well. My best guess would be that the team is focused more on their webdocs as opposed to traditional manpages. I also looked over at how ansible is packaged on ubuntu and arch, with neither of them packaging the docs (ubuntu's control file for the package even has the nodocs build profile set, as seen in these source packages).