chore: fix code snippet (#3222)

Author: Tsvetomir-Hr

components/gantt/gantt-tree/templates/column.md

@@ -19,7 +19,7 @@ The example below shows how to:
 
 >caption Using cell (column) Template
 
-`````RAZOR
+````RAZOR
 <TelerikGantt Data="@Data"
               Width="1200px"
               Height="600px"
@@ -255,4 +255,4 @@ The example below shows how to:
 
 ## See Also
 
-  * [Live Demo: Gantt Templates](https://demos.telerik.com/blazor-ui/gantt/templates)
+  * [Live Demo: Gantt Templates](https://demos.telerik.com/blazor-ui/gantt/templates)