[router] remove old/oudated/useless comments across code base (#10968)

sgl-router/tests/chat_template_loading.rs

@@ -57,7 +57,6 @@ mod tests {
         )
         .unwrap();
 
-        // Test that the custom template is used
         let messages = vec![
             spec::ChatMessage::User {
                 role: "user".to_string(),
@@ -89,7 +88,6 @@ mod tests {
             .apply_chat_template(&json_messages, params)
             .unwrap();
 
-        // Verify the custom template format
         assert!(result.contains("<|user|>Hello"));
         assert!(result.contains("<|assistant|>Hi there"));
         assert!(result.ends_with("<|assistant|>"));