DOC Fixes link to sigmoid in calibration example
@@ -124,7 +124,7 @@ plt.show()
# typical transposed-sigmoid curve. Calibration of the probabilities of
# :class:`~sklearn.naive_bayes.GaussianNB` with :ref:`isotonic` can fix
# this issue as can be seen from the nearly diagonal calibration curve.
-# :ref:sigmoid regression `<sigmoid_regressor>` also improves calibration
+# :ref:`Sigmoid regression <sigmoid_regressor>` also improves calibration
# slightly,
# albeit not as strongly as the non-parametric isotonic regression. This can be
# attributed to the fact that we have plenty of calibration data such that the
