Merge branch 'nagyv-gitlab-master-patch-80215' into 'master'

Docs cleanup and added kubernetes 1.19 support with support timelines

See merge request gitlab-org/gitlab!49498

doc/user/project/clusters/index.md

@@ -45,17 +45,17 @@ versions at any given time. We regularly review the versions we support, and
 provide a three-month deprecation period before we remove support of a specific
 version. The range of supported versions is based on the evaluation of:
 
-- Our own needs.
 - The versions supported by major managed Kubernetes providers.
 - The versions [supported by the Kubernetes community](https://kubernetes.io/docs/setup/release/version-skew-policy/#supported-versions).
 
 GitLab supports the following Kubernetes versions, and you can upgrade your
 Kubernetes version to any supported version at any time:
 
-- 1.18
-- 1.17
-- 1.16
-- 1.15
+- 1.19 (support ends on February 22, 2022)
+- 1.18 (support ends on November 22, 2021)
+- 1.17 (support ends on September 22, 2021)
+- 1.16 (support ends on July 22, 2021)
+- 1.15 (support ends on May 22, 2021)
 - 1.14 (deprecated, support ends on December 22, 2020)
 
 Some GitLab features may support versions outside the range provided here.