Fix typo and add missing vfs_zfsacl manpage

[github at samba.org]

New comment by abartlet on Samba Github repository

https://github.com/samba-team/samba/pull/111#issuecomment-376010137
Comment:
Can you split this up into two commits please?

Samba commits generally avoid doing more than one thing at once.  Metze's rule is that the word 'and' shouldn't be in a commit message, is easy to remember if not absolute.