DOC Normalization of linear_model decision_function (scikit-learn#19142)

Author: stootoon

sklearn/linear_model/_base.py

@@ -266,8 +266,8 @@ def decision_function(self, X):
         """
         Predict confidence scores for samples.
 
-        The confidence score for a sample is the signed distance of that
-        sample to the hyperplane.
+        The confidence score for a sample is proportional to the signed
+        distance of that sample to the hyperplane.
 
         Parameters
         ----------