Updated Diagnostics (markdown)

Author: Jaana B. Dogan

Diagnostics.md

@@ -69,3 +69,7 @@ Additionally to what is provided by the runtime, Go users can create their custo
 **Can I identify whether a specific user/request is responsible for the cost?**
 
 Go will soon allow users to attach [context-scoped labels](https://github.com/golang/proposal/blob/master/design/17280-profile-labels.md) to pprof records. Once profiler labels are available, it will be possible to attach user IDs, request URLs, RPC names, etc. to profiling data which later may be examined by labels.
+
+---
+
+To be continued with tracing, runtime stats, debugging and concurrency sections.