Fix copy/paste-ability of default URL presented on startup

Currently the default URL message given on the console on startup is:

---
Copy/paste this URL into your browser when you connect for the first time,
    to login with a token:
        http://(myip.com or 127.0.0.1):8888/?token=8fdc8 ...
---

This will always need editing to use. Replace with host IP (e.g. 'myip.com')
to make it copy/pastable again.

notebook/notebookapp.py

@@ -1432,7 +1432,7 @@ class NotebookApp(JupyterApp):
                 url += '/'
         else:
             if self.ip in ('', '0.0.0.0'):
-                ip = "(%s or 127.0.0.1)" % socket.gethostname()
+                ip = "%s" % socket.gethostname()
             else:
                 ip = self.ip
             url = self._url(ip)