broken Van Jacobson link

[gregbo]

The link to Van Jacobson's PARC page from links.rst is broken. Here are a couple of suggestions (in order of preference):

https://en.wikipedia.org/wiki/Van_Jacobson
https://www.internethalloffame.org//inductees/van-jacobson

[obonaventure]

Thanks for identifying this broken link, please provide a pull request