doc(UniverSheet): update documentation (#944)

Author: ArgoZhang

src/components/BootstrapBlazor.UniverSheet/Components/UniverSheet.razor.cs

@@ -71,8 +71,8 @@ public partial class UniverSheet
     public string? LoadingText { get; set; }
 
     /// <summary>
-    /// <para lang="zh">获得/设置 Frame 加载页面传递过来的数据回调方法</para>
-    /// <para lang="en">Gets or sets the callback for data posted from the Frame loaded page.</para>
+    /// <para lang="zh">获得/设置 UniverSheet 数据回调方法（一般由 Excel 按钮触发）</para>
+    /// <para lang="en">Gets or sets the UniverSheet data callback method (usually triggered by the Excel button).</para>
     /// </summary>
     [Parameter]
     public Func<UniverSheetData?, Task<UniverSheetData?>>? OnPostDataAsync { get; set; }