DOC fix typo in developers_utils.rst (scikit-learn-contrib#1031)

doc/developers_utils.rst

@@ -31,7 +31,7 @@ should be used when applicable.
 - :func:`check_neighbors_object`: Check the objects is consistent to be a NN.
 - :func:`check_target_type`: Check the target types to be conform to the current
   samplers.
-- :func:`check_sampling_strategy`: Checks that sampling target is onsistent with
+- :func:`check_sampling_strategy`: Checks that sampling target is consistent with
   the type and return a dictionary containing each targeted class with its
   corresponding number of pixel.