[MRG+1] Reorder EllipticEnvelope docstring. (scikit-learn#7734)

* Reorder EllipticEnvelope docstring.

* Fix pep8

sklearn/covariance/outlier_detection.py

@@ -106,22 +106,6 @@ class EllipticEnvelope(ClassifierMixin, OutlierDetectionMixin, MinCovDet):
 
  Read more in the :ref:`User Guide <outlier_detection>`.
 
- Attributes
- ----------
- location_ : array-like, shape (n_features,)
- Estimated robust location
-
- covariance_ : array-like, shape (n_features, n_features)
- Estimated robust covariance matrix
-
- precision_ : array-like, shape (n_features, n_features)
- Estimated pseudo inverse matrix.
- (stored only if store_precision is True)
-
- support_ : array-like, shape (n_samples,)
- A mask of the observations that have been used to compute the
- robust estimates of location and shape.
-
  Parameters
  ----------
  store_precision : bool
@@ -146,6 +130,22 @@ class EllipticEnvelope(ClassifierMixin, OutlierDetectionMixin, MinCovDet):
  The amount of contamination of the data set, i.e. the proportion
  of outliers in the data set.
 
+ Attributes
+ ----------
+ location_ : array-like, shape (n_features,)
+ Estimated robust location
+
+ covariance_ : array-like, shape (n_features, n_features)
+ Estimated robust covariance matrix
+
+ precision_ : array-like, shape (n_features, n_features)
+ Estimated pseudo inverse matrix.
+ (stored only if store_precision is True)
+
+ support_ : array-like, shape (n_samples,)
+ A mask of the observations that have been used to compute the
+ robust estimates of location and shape.
+
  See Also
  --------
  EmpiricalCovariance, MinCovDet