docs: Documentation update

Change-Id: I6f916eb822a59e980e8fb1134886c3431755119c
diff --git a/utils/trie/random-policy.hpp b/utils/trie/random-policy.hpp
index 6beaeba..813dae5 100644
--- a/utils/trie/random-policy.hpp
+++ b/utils/trie/random-policy.hpp
@@ -20,6 +20,8 @@
 #ifndef RANDOM_POLICY_H_
 #define RANDOM_POLICY_H_
 
+/// @cond include_hidden
+
 #include "ns3/random-variable.h"
 
 #include <boost/intrusive/options.hpp>
@@ -165,4 +167,6 @@
 } // ndn
 } // ns3
 
+/// @endcond
+
 #endif // RANDOM_POLICY_H