docs: Small updates and visual improvements of resulting HTML

Change-Id: Ic707fdb2625a6d4d9695c4d7f97b72e0617c1a6f
diff --git a/docs/RELEASE_NOTES.rst b/docs/RELEASE_NOTES.rst
index 104c9d5..886ca98 100644
--- a/docs/RELEASE_NOTES.rst
+++ b/docs/RELEASE_NOTES.rst
@@ -1,3 +1,5 @@
+.. _ndn-cxx v0.1.0 Release Notes:
+
 ndn-cxx v0.1.0 Release Notes
 ============================