doc: 移除 2019 文字

Author: ArgoZhang

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

@@ -8,7 +8,7 @@
     <h4>@Localizer["H1"]</h4>
 
     <Tips class="mt-3">
-        <p>@Localizer["P1"] <code>Layout</code> @Localizer["P2"] <code>dotnet new bbapp</code> @Localizer["P3"] <code>Visual Studio 2019</code> @Localizer["P4"] <code>@Localizer["P5"]</code> @Localizer["P6"] <a href="template" target="_blank">[@Localizer["P7"]]</a></p>
+        <p>@Localizer["P1"] <code>Layout</code> @Localizer["P2"] <code>dotnet new bbapp</code> @Localizer["P3"] <code>Visual Studio</code> @Localizer["P4"] <code>@Localizer["P5"]</code> @Localizer["P6"] <a href="template" target="_blank">[@Localizer["P7"]]</a></p>
         <div>
             <b class="mb-3">@Localizer["P8"]：</b>
             <code>Layout</code> @Localizer["P9"] <code>@Localizer["P10"]</code> @Localizer["P11"] <code>@Localizer["P12"]</code> @Localizer["P13"] <code>AdditionalAssemblies</code> @Localizer["P14"] <a href="https://docs.microsoft.com/en-us/aspnet/core/blazor/fundamentals/routing?view=aspnetcore-3.1#route-to-components-from-multiple-assemblies" target="_blank">[@Localizer["P15"]]</a>