Update .nitignore

Author: LamentXU123

Doc/tools/.nitignore

@@ -49,7 +49,6 @@ Doc/library/wsgiref.rst
 Doc/library/xml.dom.minidom.rst
 Doc/library/xml.dom.pulldom.rst
 Doc/library/xml.dom.rst
-Doc/library/xml.sax.handler.rst
 Doc/library/xml.sax.reader.rst
 Doc/library/xml.sax.rst
 Doc/library/xmlrpc.client.rst