Update step-by-step-tutorial.md

Author: dessyordanova

winforms-converter/step-by-step-tutorial.md

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-# Convert your existing application to Telerik UI for Winforms
+# Convert your existing application to Telerik UI for WinForms
 
-This article will guide you through the process of converting the Microsoft Windows Forms controls in your application to Telerik UI for Winforms counterparts. 
+This article will guide you through the process of converting the Microsoft Windows Forms controls in your application to Telerik UI for WinForms counterparts. 
 
 >tip We strongly recommend you using a source control system like TFS or Git. This will allow you to review the changes and restore to previous version if needed.