Fix secret text credential

Change-Id: I52e082c411f6243f9163330ccbb52a4f0b09f931
diff --git a/README.rst b/README.rst
index 88e9eff..c5df377 100644
--- a/README.rst
+++ b/README.rst
@@ -588,6 +588,8 @@
           cred_with_key:
             username: admin
             key: SOMESSHKEY
+          cred_with_text_secret:
+            secret: SOMETEXTSECRET
 
 Users enforcing from client