Clean up tracing::instrument attributes

Remove it from request handler since there's already the context of the
request path, added through TraceLayer.

src/client_server/thirdparty.rs

@@ -6,7 +6,6 @@ use std::collections::BTreeMap;
 /// # `GET /_matrix/client/r0/thirdparty/protocols`
 ///
 /// TODO: Fetches all metadata about protocols supported by the homeserver.
-#[tracing::instrument(skip(_body))]
 pub async fn get_protocols_route(
     _body: Ruma<get_protocols::Request>,
 ) -> Result<get_protocols::Response> {