Small fixes after wxHtmlTagHandler::GetParser() addition.

Amend the changes of r73839:

- Don't use covariant return type for wxHtmlWinTagHandler::GetParser() as
  VC6, which we still support, doesn't like it. Besides, this seems
  unnecessary.

- Don't make GetParser() virtual at all as this doesn't appear to be necessary
  neither.

- Add "@since 2.9.5" to the documentation of the new method.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73849 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/html/winpars.h

@@ -55,18 +55,13 @@ public:
         Constructor.
     */
     wxHtmlWinTagHandler();
-    
+
     /**
         Assigns @a parser to this handler. Each @b instance of handler
         is guaranteed to be called only from the one parser.
     */
     virtual void SetParser(wxHtmlWinParser* parser);
 
-    /**
-       Returns the parser associated with this tag handler.
-    */
-    virtual wxHtmlWinParser* GetParser() const;
-
 protected:
     /**
         Value of this attribute is identical to value of m_Parser.