DOC Capitalize Kaggle as proper noun (scikit-learn#16618)

doc/getting_started.rst

@@ -205,7 +205,7 @@ the best set of parameters. Read more in the :ref:`User Guide
     training and testing data. Indeed, since you pre-processed the data
     using the whole dataset, some information about the test sets are
     available to the train sets. This will lead to over-estimating the
-    generalization power of the estimator (you can read more in this `kaggle
+    generalization power of the estimator (you can read more in this `Kaggle
     post <https://www.kaggle.com/alexisbcook/data-leakage>`_).
 
     Using a pipeline for cross-validation and searching will largely keep