Update README.md

Co-authored-by: Eliza Weisman <eliza@buoyant.io>

README.md

@@ -408,7 +408,7 @@ are not maintained by the `tokio` project. These include:
 - [`tracing-loki`] provides a layer for shipping logs to [Grafana Loki].
 - [`tracing-logfmt`] provides a layer that formats events and spans into the logfmt format.
 - [`tracing-chrome`] provides a layer that exports trace data that can be viewed in `chrome://tracing`.
-- [`reqwest-tracing`] provides a middleware to trace [reqwest] HTTP requests.
+- [`reqwest-tracing`] provides a middleware to trace [`reqwest`] HTTP requests.
 
 (if you're the maintainer of a `tracing` ecosystem crate not in this list,
 please let us know!)