fix the definition of many static functions marked as 'const' or functions which had incoherent default values for their arguments or duplicated functions

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57991 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/richtext/richtextbuffer.h

@@ -361,7 +361,6 @@ public:
     */
     virtual void Clear();
 
-    //@{
     /**
         Clears the list style from the given range, clearing list-related attributes
         and applying any named paragraph style associated with each paragraph.
@@ -373,9 +372,6 @@ public:
     */
     bool ClearListStyle(const wxRichTextRange& range,
                         int flags = wxRICHTEXT_SETSTYLE_WITH_UNDO);
-    bool ClearListStyle(const wxRichTextRange& range,
-                        int flags = wxRICHTEXT_SETSTYLE_WITH_UNDO);
-    //@}
 
     /**
         Clears the style stack.