Update tier references

Update references to tiers after rename.

doc/operations/feature_flags.md

@@ -7,7 +7,6 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 # Feature Flags **(FREE)**
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/7433) in GitLab 11.4.
-> - [Moved](https://gitlab.com/gitlab-org/gitlab/-/issues/212318) to [GitLab Starter](https://about.gitlab.com/pricing/) in 13.4.
 > - [Moved](https://gitlab.com/gitlab-org/gitlab/-/issues/212318) to [GitLab Core](https://about.gitlab.com/pricing/) in 13.5.
 
 With Feature Flags, you can deploy your application's new features to production in smaller batches.
@@ -61,14 +60,13 @@ next to any feature flag in the list.
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/254379) in GitLab 13.5.
 
 The maximum number of feature flags per project on self-managed GitLab instances
-is 200. On GitLab.com, the maximum number is determined by [GitLab.com tier](https://about.gitlab.com/pricing/):
+is 200. For GitLab SaaS, the maximum number is determined by [tier](https://about.gitlab.com/pricing/):
 
 | Tier     | Number of feature flags per project |
 |----------|-------------------------------------|
 | Free     | 50                                  |
-| Bronze   | 100                                 |
-| Silver   | 150                                 |
-| Gold     | 200                                 |
+| Premium  | 150                                 |
+| Ultimate | 200                                 |
 
 ## Feature flag strategies