Remove an old SF reference.

Doc/html/about.html

@@ -58,8 +58,8 @@
       be sent by email to <a href="mailto:docs@python.org"
         >docs@python.org</a>.  If you find specific errors in
       this document, please report the bug at the <a
-        href="http://sourceforge.net/bugs/?group_id=5470">Python Bug
-        Tracker</a> at <a href="http://sourceforge.net/">SourceForge</a>.
+        href="http://bugs.python.org/">Python Bug
+        Tracker</a>.
       If you are able to provide suggested text, either to replace
       existing incorrect or unclear material, or additional text to
       supplement what's already available, we'd appreciate the