Fix typos so comment is readable

Author: mnaberez

supervisor/xmlrpc.py

@@ -380,10 +380,10 @@ def continue_request (self, data, request):
             try:
                 logger.trace('XML-RPC method called: %s()' % method)
                 value = self.call(method, params)
-                # application-specific: instead of we never want to
-                # marshal None (even though we could by saying allow_none=True
-                # in dumps within xmlrpc_marshall), this is meant as
-                # a debugging fixture, see issue 223.
+                # application-specific: we never want to marshal None (even
+                # though we could by saying allow_none=True in dumps within
+                # xmlrpc_marshall), this is meant as a debugging fixture, see:
+                # http://www.plope.com/software/collector/223
                 assert value is not None, (
                     'return value from method %r with params %r is None' %
                     (method, params)