doc: 更新命名空间

Author: ArgoZhang

src/BootstrapBlazor.Server/Extensions/CacheManagerExtensions.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 // Website: https://www.blazor.zone or https://argozhang.github.io/
 
-using BootstrapBlazor.Localization.Json;
 using Microsoft.Extensions.Caching.Memory;
 using System.Globalization;
 

src/BootstrapBlazor.Server/Services/CodeSnippetService.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 // Website: https://www.blazor.zone or https://argozhang.github.io/
 
-using BootstrapBlazor.Localization.Json;
 using Microsoft.Extensions.Options;
 
 namespace BootstrapBlazor.Server.Services;