Improve well-known resolver tracing span.

Signed-off-by: Jason Volk <jason@zemos.net>

src/service/resolver/well_known.rs

@@ -3,7 +3,12 @@ use tuwunel_core::{Result, debug, debug_error, debug_info, debug_warn, implement
 use super::DestString;
 
 #[implement(super::Service)]
-#[tracing::instrument(name = "well-known", level = "debug", skip(self, dest))]
+#[tracing::instrument(
+	name = "well-known",
+	level = "debug",
+	ret(level = "debug"),
+	skip(self)
+)]
 pub(super) async fn request_well_known(&self, dest: &str) -> Result<Option<DestString>> {
 	trace!("Requesting well known for {dest}");
 	let response = self