docs: Documentation update

Change-Id: I6f916eb822a59e980e8fb1134886c3431755119c
diff --git a/NFD/core/scheduler.cpp b/NFD/core/scheduler.cpp
index ed6cffd..c26d466 100644
--- a/NFD/core/scheduler.cpp
+++ b/NFD/core/scheduler.cpp
@@ -27,6 +27,8 @@
 
 namespace ns3 {
 
+/// @cond include_hidden
+
 template<>
 struct EventMemberImplObjTraits<std::function<void()>> {
   typedef std::function<void()> T;
@@ -37,6 +39,8 @@
   }
 };
 
+/// @endcond
+
 } // namespace ns3
 
 namespace nfd {