doc(Table): add IsPopover sample code (#5233)

Author: ArgoZhang

src/BootstrapBlazor.Server/Components/Samples/Table/TablesEdit.razor

@@ -158,7 +158,7 @@
             <TableColumn @bind-Field="@context.DateTime" Width="180" />
             <TableColumn @bind-Field="@context.Name" />
             <TableColumn @bind-Field="@context.Address" Rows="3" />
-            <TableColumn @bind-Field="@context.Education" />
+            <TableColumn @bind-Field="@context.Education" IsPopover="true" />
             <TableColumn @bind-Field="@context.Count" IsVisibleWhenAdd="false" />
             <TableColumn @bind-Field="@context.Complete" IsVisibleWhenEdit="false" />
         </TableColumns>