Doc cleanup

Probably not ready to merge.

I would like feed back on most of this.
The index file for offset boxes was not included anywhere and this seemed
like a good place.
On Jun 12, 2014 7:01 AM, "Phil Elson" <notifications@github.com> wrote:

> In doc/api/artist_api.rst:
>
> > @@ -4,11 +4,11 @@
> >  artists
> >  *******
> >
> > -.. inheritance-diagram:: matplotlib.patches matplotlib.lines matplotlib.text
> > +.. inheritance-diagram:: matplotlib.patches matplotlib.lines matplotlib.text matplotlib.offsetbox
>
> Does offsetbox deserve this prominence? I'm guessing collections are
> documented elsewhere, but maybe they should be mentioned here?
>
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