Doc patch ping

[Ben Elliston]

> > but needs someone familiar with that code to review.  That said, if you
> > feel you match this description sufficiently well, Ben, go ahead!
> > 
> The wording looks OK to me, with a minor nit for ei_next and ei_prev.
> The text should say that these two take the _address_ of an edge
> iterator.

Thanks for reviewing it, Diego.  OK with the changes you've mentioned?

Cheers, Ben
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