removed parameter that was documented as attribute (scikit-learn#7711)

Author: amueller

sklearn/covariance/outlier_detection.py

@@ -108,10 +108,6 @@ class EllipticEnvelope(ClassifierMixin, OutlierDetectionMixin, MinCovDet):
 
     Attributes
     ----------
-    `contamination` : float, 0. < contamination < 0.5
-      The amount of contamination of the data set, i.e. the proportion of \
-      outliers in the data set.
-
     location_ : array-like, shape (n_features,)
         Estimated robust location