Add a simple example to make it easier to get started (by copy&paste).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64445 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/aboutdlg.h

@@ -30,6 +30,22 @@
     either of those is used, wxAboutBox() will automatically use the generic version
     so you should avoid specifying these fields to achieve more native look and feel.
     
+    Example of usage:
+    @code
+    void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
+    {
+        wxAboutDialogInfo aboutInfo;
+        aboutInfo.SetName("MyApp");
+        aboutInfo.SetVersion(MY_APP_VERSION_STRING);
+        aboutInfo.SetDescription(_("My wxWidgets-based application!"));
+        aboutInfo.SetCopyright("(C) 1992-2010");
+        aboutInfo.SetWebSite("http://myapp.org");
+        aboutInfo.AddDeveloper("My Self");
+
+        wxAboutBox(aboutInfo);
+    }
+    @endcode
+
     @library{wxadv}
     @category{cmndlg,data}