Merge branch 'docs-update-tiers-with-eeu' into 'master'

Docs: add EEU tier to the landing page

See merge request gitlab-org/gitlab-ce!15719

doc/README.md

@@ -13,13 +13,14 @@ GitLab offers the most scalable Git-based fully integrated platform for software
 - **GitLab Community Edition (CE)** is an [opensource product](https://gitlab.com/gitlab-org/gitlab-ce/),
 self-hosted, free to use. Every feature available in GitLab CE is also available on GitLab Enterprise Edition (Starter and Premium) and GitLab.com.
 - **GitLab Enterprise Edition (EE)** is an [opencore product](https://gitlab.com/gitlab-org/gitlab-ee/),
-self-hosted, fully featured solution of GitLab, available under distinct [subscriptions](https://about.gitlab.com/products/): **GitLab Enterprise Edition Starter (EES)** and **GitLab Enterprise Edition Premium (EEP)**.
+self-hosted, fully featured solution of GitLab, available under distinct [subscriptions](https://about.gitlab.com/products/): **GitLab Enterprise Edition Starter (EES)**, **GitLab Enterprise Edition Premium (EEP)**, and **GitLab Enterprise Edition Ultimate (EEU)**.
 - **GitLab.com**: SaaS GitLab solution, with [free and paid subscriptions](https://about.gitlab.com/gitlab-com/). GitLab.com is hosted by GitLab, Inc., and administrated by GitLab (users don't have access to admin settings).
 
 > **GitLab EE** contains all features available in **GitLab CE**,
 plus premium features available in each version: **Enterprise Edition Starter**
-(**EES**) and **Enterprise Edition Premium** (**EEP**). Everything available in
-**EES** is also available in **EEP**.
+(**EES**), **Enterprise Edition Premium** (**EEP**), and **Enterprise Edition Premium**
+(**EEU**). Everything available in **EES** is also available in **EEP**. Every feature
+available in **EEP** is also available in **EEU**.
 
 ----
 
@@ -33,7 +34,7 @@ Shortcuts to GitLab's most visited docs:
 
 - [User documentation](user/index.md)
 - [Administrator documentation](#administrator-documentation)
-- [Technical Articles](articles/index.md)
+- [Contributor documentation](#contributor-documentation)
 
 ## Getting started with GitLab