Docs: Updated Dependency Proxy tier

It was incorrect in the docs.
Closes: https://gitlab.com/gitlab-org/gitlab/-/issues/232859

doc/user/packages/dependency_proxy/index.md

@@ -4,9 +4,9 @@ group: Package
 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
 ---
 
-# Dependency Proxy **(PREMIUM ONLY)**
+# Dependency Proxy **(PREMIUM)**
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/7934) in [GitLab Ultimate](https://about.gitlab.com/pricing/) 11.11.
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/7934) in [GitLab Premium](https://about.gitlab.com/pricing/) 11.11.
 
 NOTE: **Note:**
 This is the user guide. In order to use the dependency proxy, an administrator
@@ -82,6 +82,6 @@ for more details.
 
 The following limitations apply:
 
-- Only public groups are supported (authentication is not supported yet).
+- Only [public groups are supported](https://gitlab.com/gitlab-org/gitlab/-/issues/11582) (authentication is not supported yet).
 - Only Docker Hub is supported.
 - This feature requires Docker Hub being available.