document default ctor

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57044 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/log.h

@@ -445,6 +445,11 @@ public:
 class wxLogBuffer : public wxLog
 {
 public:
+    /**
+        The default ctor does nothing.
+    */
+    wxLogBuffer();
+
     /**
         Shows all the messages collected so far to the user (using a message box in the
         GUI applications or by printing them out to the console in text mode) and