Fix link formatting in jaeger.md (#356)

Author: curiousleo

website/docs/middleware/jaeger.md

@@ -173,5 +173,5 @@ func main() {
 
 ## References
 
-- [https://github.com/opentracing/opentracing-go](Opentracing Library)
-- [https://github.com/jaegertracing/jaeger-client-go#environment-variables](Jaeger configuration)
+- [Opentracing Library](https://github.com/opentracing/opentracing-go)
+- [Jaeger configuration](https://github.com/jaegertracing/jaeger-client-go#environment-variables)