It amusing, how long it wasn't noticed, but apparently when you build Samba documentation together with the Samba suite the vfs_zfsacl.8 is not build. That's no wonder as it's missing from the docs-xml/wscript_build. That possibly wasn't noticed cause pre-packaged manpages are build through other route, via the configure/make, where *.xml globing catches all the pages. The issue was noticed by Anodos on FreeNAS forum.
Created attachment 13818 [details] Fix typo and add missing vfs_zfsacl manpage
Created attachment 13827 [details] git-am fix for 4.7.next and 4.6.next
Pushed to autobuild-v4-{6,7}-test.
Pushed to both branches. Closing out bug report. Thanks!