Update examples doc overview page

(merge main -> ce/main 115860)

[git-p4: depot-paths = "//dev/coherence-ce/main/": change = 115861]

Author: thegridman

prj/examples/guides/README.adoc

@@ -159,6 +159,14 @@ This guide explains how to use the Coherence Executor Service.
 This guide walks you through how to configure CDI Response Caching to cache the results of method invocations.
 --
 
+[CARD]
+.Certificate Based Security
+[link=examples/guides/810-custom-access-controller/README.adoc]
+--
+This guide walks you through how to configure Coherence to use private key and certificate-based security
+using a custom access controller, and custom Extend identity provider and identity asserter.
+--
+
 [CARD]
 .Key Association
 [link=examples/guides/905-key-association/README.adoc]