Mention moving Tracing to Core in the docs

doc/operations/tracing.md

@@ -4,9 +4,10 @@ group: APM
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
 ---
 
-# Tracing **(ULTIMATE)**
+# Tracing
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/7903) in GitLab Ultimate 11.5.
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/7903) in [GitLab Ultimate](https://about.gitlab.com/pricing/) 11.5.
+> - [Moved to GitLab Core](https://gitlab.com/gitlab-org/gitlab/-/issues/42645) in 13.5.
 
 Tracing provides insight into the performance and health of a deployed application,
 tracking each function or microservice which handles a given request.