doc: 更新示例

Author: ArgoZhang

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

@@ -39,7 +39,6 @@
            Introduction="@Localizer["SearchesItemTemplateIntro"]"
            Name="ItemTemplate">
     <Search PlaceHolder="@Localizer["SearchesPlaceHolder"]"
-            OnGetDisplayText="GetDisplayText"
             OnSearch="@OnSearchFoo">
         <ItemTemplate>
             <div>@context.Name</div>

src/BootstrapBlazor.Server/Components/Samples/Searches.razor.cs

@@ -54,8 +54,6 @@ private Task<IEnumerable<string>> OnKeyboardSearch(string searchText)
 
     private Foo Model { get; set; } = new Foo() { Name = "" };
 
-    private static string? GetDisplayText(Foo foo) => foo.Name;
-
     private static async Task<IEnumerable<Foo>> OnSearchFoo(string searchText)
     {
         await Task.Delay(100);