I added the ToC for docs with longer sections, not shorter docs. Thought it would help users navigate thru the longer docs.

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> On May 29, 2014, at 8:40 PM, "Mark W. Foster" <notifications@github.com> wrote:
> 
> In doc/descriptors_document.md:
> 
> > @@ -1,104 +1,96 @@
> >  # @title API Descriptor Document
> > +## Contents
> > +- [Overview](#overview)
> Like this. Should we do it on each page?
> 
> —
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