docs: Prepare release 0.5.1

Change-Id: I377269e4f510b720a4ab11e480c1d0551a32b56e
Refs: #3859
diff --git a/docs/tutorials/security-library.rst b/docs/tutorials/security-library.rst
index 1da1e61..392bbf6 100644
--- a/docs/tutorials/security-library.rst
+++ b/docs/tutorials/security-library.rst
@@ -1,3 +1,5 @@
+.. _Security Library Tutorial:
+
 Security Library Tutorial
 =========================