Update namespace selection in Blazor tutorial

Adjusted the namespace declaration in the Blazor tutorial to conditionally use 'TodoApp.Pages' for Blazor UI and 'TodoApp.Components.Pages' otherwise. This clarifies the correct namespace usage based on the UI framework.

docs/en/tutorials/todo/single-layer/index.md

@@ -580,7 +580,11 @@ using TodoApp.Services;
 using TodoApp.Services.Dtos;
 {{end}}
 
+{{if UI=="Blazor"}}
 namespace TodoApp.Pages;
+{{else}}
+namespace TodoApp.Components.Pages;
+{{end}}
 
 public partial class Index
 {