Remove Starter references from Groups page

Remove references to Starter tier from Groups page.

doc/user/group/index.md

@@ -216,9 +216,8 @@ There are two different ways to add a new project to a group:
 
 ### Specify who can add projects to a group
 
-> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/2534) in [GitLab Premium](https://about.gitlab.com/pricing/) 10.5.
-> - Brought to [GitLab Starter](https://about.gitlab.com/pricing/) in 10.7.
-> - [Moved](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/25975) to [GitLab Free](https://about.gitlab.com/pricing/) in 11.10.
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/2534) in GitLab Premium 10.5.
+> - [Moved](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/25975) to GitLab Free in 11.10.
 
 By default, [Developers and Maintainers](../permissions.md#group-members-permissions) can create projects under a group.
 
@@ -233,7 +232,7 @@ To change this setting globally, see [Default project creation protection](../ad
 
 ## Group activity analytics **(PREMIUM)**
 
-> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/207164) in GitLab [Starter](https://about.gitlab.com/pricing/) 12.10 as
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/207164) in GitLab 12.10 as
 a [beta feature](https://about.gitlab.com/handbook/product/#beta).
 
 For a group, you can view how many merge requests, issues, and members were created in the last 90 days.
@@ -619,7 +618,7 @@ To enable prevent project forking:
 
 ## Group push rules **(PREMIUM)**
 
-> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/34370) in [GitLab Starter](https://about.gitlab.com/pricing/) 12.8.
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/34370) in GitLab 12.8.
 > - [Feature flag removed](https://gitlab.com/gitlab-org/gitlab/-/issues/224129) in GitLab 13.4.
 
 Group push rules allow group maintainers to set