DOC fix several references in what's new
This was done at the same time as Qin's clean up... but here are a few
extra changes.
@@ -756,6 +756,7 @@ Kernels:
linear_model.logistic_regression_path
linear_model.orthogonal_mp
linear_model.orthogonal_mp_gram
+ linear_model.ridge_regression
.. _manifold_ref:
