Starts handler definition. {\it name} is handler identifier (in fact
part of class name), {\it tags} is string containing list of tags
supported by this handler (in uppercase). This macro derives new class from
-wxHtmlWinTagHandler and implements it's
+wxHtmlWinTagHandler and implements it is
\helpref{GetSupportedTags}{wxhtmltaghandlergetsupportedtags} method.
Example: TAG\_HANDLER\_BEGIN(FONTS, "B,I,U,T")