Merge branch '21.1.5+' of https://github.com/DevExpress-Examples/wpf-spreadsheetcontrol-api-part-2 into 21.1.5+

Author: geumjaLee

Readme.md

@@ -46,4 +46,4 @@ This sample introduces API properties and methods used to perform the following
 * [Pictures in Spreadsheet Documents](https://docs.devexpress.com/WPF/400492/controls-and-libraries/spreadsheet/charts-and-graphics/pictures)
 * [Spreadsheet for WPF Examples](https://docs.devexpress.com/WPF/16123/controls-and-libraries/spreadsheet/examples)
 * [Sort Data in Spreadsheet for WPF](https://docs.devexpress.com/WPF/17471/controls-and-libraries/spreadsheet/data-presentation/sorting)
-* [Filter Data in Spreadsheet for WPF](https://docs.devexpress.com/WPF/18162/controls-and-libraries/spreadsheet/data-presentation/filtering)
+* [Filter Data in Spreadsheet for WPF](https://docs.devexpress.com/WPF/18162/controls-and-libraries/spreadsheet/data-presentation/filtering)