dead documentation link

[Benjamin Kosnik]

> > this should be fixed now. I ran the docs through the W3C link
> > checker and did some fixups, then regenerated the HTML. Please
> > allow a bit of time for this to propagate to the web page.
> 
> ... and this. 

and this and this. This fixes all the ones from the w3c validator that
I understand. The broken URI bits remaining seem bogus.

-benjamin
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