[master] 2e12bb7 another reference to the Contributing wiki page

[Nils Goroll]

commit 2e12bb7fde08aa294cb1e57947f0fc90d515bf71
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Tue Mar 18 17:05:02 2014 +0100

    another reference to the Contributing wiki page

diff --git a/doc/sphinx/tutorial/introduction.rst b/doc/sphinx/tutorial/introduction.rst
index 50a7296..ad8784a 100644
--- a/doc/sphinx/tutorial/introduction.rst
+++ b/doc/sphinx/tutorial/introduction.rst
@@ -61,6 +61,9 @@ the Varnish Governing Board which currently consist of Poul-Henning
 Kamp (Architect), Rogier Mulhuijzen (Fastly) and Kristian Lyngstøl
 (Varnish Software).
 
+Please see https://www.varnish-cache.org/trac/wiki/Contributing as
+a starting point if you would like to contribute to Varnish.
+
 Getting in touch
 ----------------