Update toolbar.md

Author: CCMKarthik123

ej2-asp-core-mvc/pdfviewer/EJ2_ASP.MVC/toolbar.md

@@ -587,10 +587,9 @@ N>The icons are embedded in the font file used in above code snippet.
 
 ```
 
-Sample :
-[https://ej2.syncfusion.com/aspnetcore/PdfViewer/Default#/material](https://ej2.syncfusion.com/aspnetcore/PdfViewer/Default#/material)
+[View sample in GitHub](https://github.com/SyncfusionExamples/asp-core-pdf-viewer-examples/tree/master/How%20to/Create%20Custom%20Toolbar)
 
 ## See also
 
 * [Toolbar customization](./how-to/toolbar_customization)
-* [Feature Modules](./feature-module)
+* [Feature Modules](./feature-module)