DOC fix typo in user manual
@@ -218,7 +218,7 @@ mask of the features containing missing values at ``fit`` time::
>>> indicator.features_
array([0, 1, 3])
-The ``features`` parameter can be set to ``'all'`` to returned all features
+The ``features`` parameter can be set to ``'all'`` to return all features
whether or not they contain missing values::
>>> indicator = MissingIndicator(missing_values=-1, features="all")
