Merge pull request #6188 from jgarte/jgarte-patch-1-notebookapp

Fix typo in docstring

Author: kevin-bates

notebook/notebookapp.py

@@ -1076,7 +1076,7 @@ def _token_changed(self, change):
     allow_password_change = Bool(True, config=True,
                     help="""Allow password to be changed at login for the notebook server.
 
-                    While loggin in with a token, the notebook server UI will give the opportunity to
+                    While logging in with a token, the notebook server UI will give the opportunity to
                     the user to enter a new password at the same time that will replace
                     the token login mechanism.