docs: Documentation update

Change-Id: I6f916eb822a59e980e8fb1134886c3431755119c
diff --git a/utils/topology/annotated-topology-reader.cpp b/utils/topology/annotated-topology-reader.cpp
index a10cf2f..c62b7e5 100644
--- a/utils/topology/annotated-topology-reader.cpp
+++ b/utils/topology/annotated-topology-reader.cpp
@@ -495,6 +495,8 @@
   }
 }
 
+/// @cond include_hidden
+
 template<class Names>
 class name_writer {
 public:
@@ -522,6 +524,8 @@
   return name_writer<Names>(n);
 }
 
+/// @endcond
+
 void
 AnnotatedTopologyReader::SaveGraphviz(const std::string& file)
 {
@@ -560,4 +564,5 @@
   boost::property_map<Graph, boost::vertex_name_t>::type names = get(boost::vertex_name, graph);
   write_graphviz(of, graph, make_name_writer(names));
 }
+
 }