Disambiguate with Netflix and Javascript zuul

There are two other projects named zuul. Let's make sure we disambiguate
so users aren't confused.

Change-Id: I6c459d062970e2abcbb890d626297595d979d324
diff --git a/doc/source/index.rst b/doc/source/index.rst
index 677e958..6e1b52e 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -12,6 +12,14 @@
 :doc:`admin/index` useful.  If you want help make Zuul itself better,
 take a look at the :doc:`developer/index`.
 
+If you are looking for the Edge routing service named Zuul that is
+related to Netflix, it can be found here:
+https://github.com/Netflix/zuul
+
+If you are looking for the Javascript testing tool named Zuul, it
+can be found here:
+https://github.com/defunctzombie/zuul
+
 Contents:
 
 .. toctree::