DOC fix a glitch in pca docstring
@@ -220,7 +220,7 @@ class PCA(_BasePCA):
mean_ : array, shape (n_features,)
Per-feature empirical mean, estimated from the training set.
- Equal to `X.mean(axis=1)`.
+ Equal to `X.mean(axis=0)`.
n_components_ : int
The estimated number of components. When n_components is set
