Change GitLab Starter to Free

The destination page says this feature is available in GitLab Free,
so that's what I'm changing this link to.

doc/user/project/repository/branches/index.md

@@ -19,8 +19,8 @@ After pushing your changes to a new branch, you can:
 - [Discuss](../../../discussions/index.md) your implementation with your team
 - Preview changes submitted to a new branch with [Review Apps](../../../../ci/review_apps/index.md).
 
-With [GitLab Starter](https://about.gitlab.com/pricing/), you can also request
-[approval](../../merge_requests/merge_request_approvals.md) from your managers.
+You can also request [approval](../../merge_requests/merge_request_approvals.md)
+from your managers.
 
 For more information on managing branches using the GitLab UI, see: