fix: update example of Engineering Blogs in RSSHub docs (#16546)

* 制作imhcg的路由

* 遵循路由规范

* Update lib/routes/imhcg/blog.ts

Co-authored-by: Tony <TonyRL@users.noreply.github.com>

* Update lib/routes/imhcg/blog.ts

Co-authored-by: Tony <TonyRL@users.noreply.github.com>

* 修改imhcg的namespace，使其与route name不同

* Update lib/routes/imhcg/namespace.ts

Co-authored-by: Tony <TonyRL@users.noreply.github.com>

* 修改imhcg的example

lib/routes/imhcg/blog.ts

@@ -6,7 +6,7 @@ export const route: Route = {
     path: '/',
     categories: ['blog'],
     view: ViewType.Notifications,
-    example: '/',
+    example: '/imhcg',
     parameters: {},
     radar: [
         {