Add missing link to user guide in PolynomialFeatures API documentation
@@ -30,6 +30,8 @@ class PolynomialFeatures(TransformerMixin, BaseEstimator):
For example, if an input sample is two dimensional and of the form
[a, b], the degree-2 polynomial features are [1, a, b, a^2, ab, b^2].
+ Read more in the :ref:`User Guide <polynomial_features>`.
+
Parameters
----------
degree : int, default=2
