DOC: remove a broken link (gmane.org)

Author: mgeier

src/jack.py

@@ -1168,9 +1168,8 @@ def set_port_rename_callback(self, callback=None, only_available=True):
         Notes
         -----
         The port rename callback is not available in JACK 1!
-        See `this mailing list posting`__ and `this commit message`__.
+        See and `this commit message`__.
 
-        __ http://comments.gmane.org/gmane.comp.audio.jackit/28888
         __ https://github.com/jackaudio/jack1/commit/
            94c819accfab2612050e875c24cf325daa0fd26d