Correcting KeyLocator (allow different types) and initial type assignment

git-svn-id: svn+ssh://dyadis.cs.arizona.edu/NDN-spec/spec-sphinx@188 c5937c81-b952-4fd9-96ba-3036b240b622
diff --git a/index.rst b/index.rst
index 62a99f2..a6ff962 100644
--- a/index.rst
+++ b/index.rst
@@ -11,6 +11,7 @@
    interest
    data
    signature
+   types
    :maxdepth: 3