Remove tier badge from DevOps Report

Since the introduction of the DevOps Adoption report, DevOps Report
is no longer a single feature but rather a combination of two features
in different tiers. As a result, it should not have a tier badge, so
this removes the tier badge from the documentation.

doc/user/admin_area/analytics/dev_ops_report.md

@@ -4,7 +4,7 @@ group: unassigned
 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/#assignments
 ---
 
-# DevOps Report **(FREE)**
+# DevOps Report
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/30469) in GitLab 9.3.
 > - [Renamed from Conversational Development Index](https://gitlab.com/gitlab-org/gitlab/-/issues/20976) in GitLab 12.6.