Update tiers for analytics-related pages

Update the tiers listed for analytics-related docs pages.

doc/user/admin_area/analytics/dev_ops_report.md

 ---
-stage: none
-group: unassigned
+stage: Manage
+group: Optimize
 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
+# DevOps Report **(FREE SELF)**
 
-> - [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.
+> [Renamed from Conversational Development Index](https://gitlab.com/gitlab-org/gitlab/-/issues/20976) in GitLab 12.6.
 
 The DevOps Report gives you an overview of your entire instance's adoption of
 [Concurrent DevOps](https://about.gitlab.com/topics/concurrent-devops/)
@@ -15,7 +14,7 @@ from planning to monitoring.
 
 To see DevOps Report, go to **Admin Area > Analytics > DevOps Report**.
 
-## DevOps Score **(FREE)**
+## DevOps Score
 
 NOTE:
 Your GitLab instance's [usage ping](../settings/usage_statistics.md#usage-ping) must be activated in order to use this feature.
@@ -34,7 +33,7 @@ Usage ping data is aggregated on GitLab servers for analysis. Your usage
 information is **not sent** to any other GitLab instances. If you have just started using GitLab, it may take a few weeks for data to be
 collected before this feature is available.
 
-## DevOps Adoption **(ULTIMATE)**
+## DevOps Adoption **(ULTIMATE SELF)**
 
 [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/247112) in GitLab 13.7 as a [Beta feature](https://about.gitlab.com/handbook/product/gitlab-the-product/#beta).
 

doc/user/admin_area/analytics/index.md

 ---
-stage: none
-group: unassigned
+stage: Manage
+group: Optimize
 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
 ---
 
-# Instance-level analytics
+# Instance-level analytics **(FREE SELF)**
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/41416) in GitLab 11.2.
 
@@ -12,5 +12,5 @@ Administrators have access to instance-wide analytics, as shown in **Admin Area
 
 There are several kinds of statistics:
 
-- [DevOps Report](dev_ops_report.md): Provides an overview of your entire instance's feature usage. **(FREE)**
-- [Usage Trends](usage_trends.md): Shows how much data your instance contains, and how that is changing. **(FREE)**
+- [DevOps Report](dev_ops_report.md): Provides an overview of your entire instance's feature usage.
+- [Usage Trends](usage_trends.md): Shows how much data your instance contains, and how that is changing.

doc/user/admin_area/analytics/usage_trends.md

@@ -4,7 +4,7 @@ group: Optimize
 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
 ---
 
-# Usage Trends **(FREE)**
+# Usage Trends **(FREE SELF)**
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/235754) in GitLab 13.5 behind a feature flag, disabled by default.
 > - [Became enabled by default](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/46962) in GitLab 13.6.