Update the doc

doc/whats_new.rst

@@ -53,6 +53,7 @@ API changes summary
 - Two base classes :class:`BaseBinaryclassSampler` and :class:`BaseMulticlassSampler` have been created to handle the target type and raise warning in case of abnormality. By `Guillaume Lemaitre`_ and `Christos Aridas`_.
 - Move `random_state` to be assigned in the :class:`SamplerMixin` initialization. By `Guillaume Lemaitre`_.
 - Provide estimators instead of parameters in :class:`combine.SMOTEENN` and :class:`combine.SMOTETomek`. Therefore, the list of parameters have been deprecated. By `Guillaume Lemaitre`_ and `Christos Aridas`_.
+- `n_neighbors` accept `KNeighborsMixin` based object for :class:`under_sampling.EditedNearestNeighbors`, :class:`under_sampling.CondensedNeareastNeigbour`, :class:`under_sampling.NeighbourhoodCleaningRule`, :class:`under_sampling.RepeatedEditedNearestNeighbours`, and :class:`under_sampling.AllKNN`. By `Guillaume Lemaitre`_.
 
 Documentation changes
 ~~~~~~~~~~~~~~~~~~~~~