Fix typo

Co-authored-by: Simon Li <[email protected]>

jupyterhub/spawner.py

@@ -323,7 +323,7 @@ def _default_access_scopes(self):
           applied to their server before spawning.
         - *spawner_override* - a dictionary with overrides to apply to the Spawner
           settings. Each value can be either the final value to change or a callable that
-          take the `Spawner` instance as parameter and return the final value.
+          take the `Spawner` instance as parameter and returns the final value.
           If the traitlet being overriden is a *dictionary*, the dictionary
           will be *recursively updated*, rather than overriden. If you want to
           remove a key, set its value to `None`