remove spurious s in attribute doc.
@@ -558,7 +558,7 @@ class QuadraticDiscriminantAnalysis(BaseEstimator, ClassifierMixin):
store_covariance : boolean
If True the covariance matrices are computed and stored in the
- `self.covariances_` attribute.
+ `self.covariance_` attribute.
.. versionadded:: 0.17
