Add environment scope pricing tier to group variable docs

doc/ci/environments/index.md

@@ -676,6 +676,7 @@ fetch = +refs/environments/*:refs/remotes/origin/environments/*
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/2112) in [GitLab Premium](https://about.gitlab.com/pricing/) 9.4.
 > - [Environment scoping for CI/CD variables was moved to all tiers](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/30779) in GitLab 12.2.
+> - [Environment scoping for Group CI/CD variables](https://gitlab.com/gitlab-org/gitlab/-/issues/2874) added to GitLab Premium in 13.11
 
 You can limit the environment scope of a CI/CD variable by
 defining which environments it can be available for.

doc/ci/variables/README.md

@@ -181,7 +181,7 @@ To add a group variable:
    - **Key**: Must be one line, with no spaces, using only letters, numbers, or `_`.
    - **Value**: No limitations.
    - **Type**: [`File` or `Variable`](#cicd-variable-types).
-   - **Environment scope** (optional): `All`, or specific [environments](#limit-the-environment-scope-of-a-cicd-variable).
+   - **Environment scope** (optional): `All`, or specific [environments](#limit-the-environment-scope-of-a-cicd-variable). **PREMIUM**
    - **Protect variable** (Optional): If selected, the variable is only available
      in pipelines that run on protected branches or tags.
    - **Mask variable** (Optional): If selected, the variable's **Value** is masked