_content/doc/fuzz: add links to new tutorial
_content/doc/fuzz: add links to new tutorial

Change-Id: I9c8099270a1215bd5b5c3043d2bcc5d097a3dc95
Reviewed-on: https://go-review.googlesource.com/c/website/+/378598
Run-TryBot: Katie Hockman <e321a8fd89c4908465ddaf8d5d0d62480efacb63@golang.org>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: DO NOT USE <87e9c6d529889242b7e184afb632328636553ab4@google.com>
Trust: DO NOT USE <b67e673702df165eba99d19477fbb63eec0d8851@google.com>

golang/website,golang/website,golang/website,golang/website,golang/website,golang/website,golang/website