doc: 更新示例

Author: ArgoZhang

src/BootstrapBlazor.Server/Components/Samples/UploadDrops.razor

@@ -54,7 +54,7 @@
     </section>
     <DropUpload OnChange="@OnDropUpload" FooterText="@Localizer["DropUploadFooterText"]"
                 IsDisabled="@_isDisabled" IsMultiple="@_isMultiple"
-                ShowProgress="@_showProgress" ShowFooter="@_showFooter"></DropUpload>
+                ShowProgress="@_showProgress" ShowUploadFileList="@_showUploadFileList" ShowFooter="@_showFooter"></DropUpload>
 </DemoBlock>
 
 <AttributeTable Items="@GetAttributes()"></AttributeTable>