docs(grid): add sample error for duplicate component name kb

Author: marin-bratanov

knowledge-base/components-with-same-name.md

@@ -17,6 +17,7 @@ When creating components, make sure that you use unique names for them and their
 * Cryptic errors from things and Parameters that should work, such as:
     * for a Telerik grid: _error CS0246: The type or namespace name 'TItem' could not be found (are you missing a using directive or an assembly reference?)_
     * for a Telerik button _Unhandled exception rendering component: Object of type 'TestProject.Pages.TelerikButton' does not have a property matching the name 'ChildContent'._
+    * Multiple components use the tag 'TelerikGrid'
 
 These last error messages can be observed if you have a component called `TelerikGrid.razor` in your app, and you attempt to use the `<TelerikGrid>` component provided by Telerik UI for Blazor in the same app (respectively, a `TelerikButton.razor` and `<TelerikButton>` components).