Update cross_validation.rst

Minor typo fixes.
wwwslinger · Oct 22, 2013 · d4447e7 · d4447e7
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diff --git a/doc/modules/cross_validation.rst b/doc/modules/cross_validation.rst
@@ -93,7 +93,7 @@ where the number of samples is very small.
 Computing cross-validated metrics
 =================================
 
-The simplest way to use perform cross-validation in to call the
+The simplest way to use cross-validation is to call the
 :func:`cross_val_score` helper function on the estimator and the dataset.
 
 The following example demonstrates how to estimate the accuracy of a linear