Fix dev doc link in README.rst

Fix bad link to the developer documentation.

Change-Id: I5d4b48ada4959dda735d5ea050c663f0d6ede621
diff --git a/README.rst b/README.rst
index 932edbf..c55f7b3 100644
--- a/README.rst
+++ b/README.rst
@@ -58,7 +58,7 @@
    Some of the information in the specs may be effectively superceded
    by changes here, which are still undergoing review.
 
-4) Read documentation on the internal data model and testing: http://docs.openstack.org/infra/zuul/feature/zuulv3/internals.html
+4) Read developer documentation on the internal data model and testing: http://docs.openstack.org/infra/zuul/feature/zuulv3/developer.html
 
    The general philosophy for Zuul tests is to perform functional
    testing of either the individual component or the entire end-to-end