Fixed xref links in AveragedPerceptron (#3391)

Author: Shahab Moradi

src/Microsoft.ML.StandardTrainers/Standard/Online/AveragedPerceptron.cs

@@ -27,8 +27,8 @@ namespace Microsoft.ML.Trainers
     /// </summary>
     /// <remarks>
     /// <format type="text/markdown"><![CDATA[
-    /// To create this trainer, use [AveragedPerceptron](xref:Microsoft.ML.StandardTrainersCatalog.AveragedPerceptron(Microsoft.ML.BinaryClassificationCatalog.BinaryClassificationTrainers,System.String,System.String,Microsoft.ML.Trainers.IClassificationLoss,System.Single,System.Boolean,System.Single,System.Int32)
-    /// or [AveragedPerceptron(Options)](xref:Microsoft.ML.StandardTrainersCatalog.AveragedPerceptron(Microsoft.ML.BinaryClassificationCatalog.BinaryClassificationTrainers,Microsoft.ML.Trainers.AveragedPerceptronTrainer.Options).
+    /// To create this trainer, use [AveragedPerceptron](xref:Microsoft.ML.StandardTrainersCatalog.AveragedPerceptron(Microsoft.ML.BinaryClassificationCatalog.BinaryClassificationTrainers,System.String,System.String,Microsoft.ML.Trainers.IClassificationLoss,System.Single,System.Boolean,System.Single,System.Int32))
+    /// or [AveragedPerceptron(Options)](xref:Microsoft.ML.StandardTrainersCatalog.AveragedPerceptron(Microsoft.ML.BinaryClassificationCatalog.BinaryClassificationTrainers,Microsoft.ML.Trainers.AveragedPerceptronTrainer.Options)).
     ///
     /// [!include[io](~/../docs/samples/docs/api-reference/io-columns-binary-classification.md)]
     ///