ensure all topic overviews have an horizontal rule with the list of the sections above

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52257 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/doxygen/overviews/stream.h

@@ -18,6 +18,15 @@ Classes:
 @li wxFilterInputStream
 @li wxFilterOutputStream
 
+@li @ref overview_stream_intro
+@li @ref overview_stream_example
+
+<hr>
+
+
+
+@section overview_stream_intro Introduction
+
 Standard C++ streams can cause problems on several platforms: they work quite
 well in most cases, but in the multi-threaded case, for example, they have many
 problems. Some Borland compilers refuse to work at all with them and using
@@ -58,6 +67,7 @@ nothing in the case of wxMemoryIn/OutputStream which bases itself on
 wxStreamBuffer. This could also be a simple link to the a true syscall (for
 example read(...), write(...)).
 
+
 @section overview_stream_example Example
 
 Usage is simple. We can take the example of wxFileInputStream and here is some