zsh: Always install extra documentation; remove +doc variant.


git-svn-id: http://svn.macports.org/repository/macports/trunk/dports@101690 d073be05-634f-4543-b044-5fe20cf6d1d6
zsh: Adjust whitespace; move notes to end.


git-svn-id: http://svn.macports.org/repository/macports/trunk/dports@101691 d073be05-634f-4543-b044-5fe20cf6d1d6
zsh: Use ${doc} throughout.


git-svn-id: http://svn.macports.org/repository/macports/trunk/dports@101692 d073be05-634f-4543-b044-5fe20cf6d1d6