DOC change 'in' to 'is' in pca fit function docstring
@@ -326,7 +326,7 @@ class PCA(_BasePCA):
Parameters
----------
X : array-like, shape (n_samples, n_features)
- Training data, where n_samples in the number of samples
+ Training data, where n_samples is the number of samples
and n_features is the number of features.
y : Ignored
