Update link to the SAX homepage.

Doc/lib/xmlsax.tex

@@ -112,7 +112,7 @@ exception classes.
 
 
 \begin{seealso}
-  \seetitle[http://www.megginson.com/SAX/]{SAX: The Simple API for
+  \seetitle[http://www.saxproject.org/]{SAX: The Simple API for
             XML}{This site is the focal point for the definition of
             the SAX API.  It provides a Java implementation and online
             documentation.  Links to implementations and historical