Resolve "Document how to customize the permissions for 'agentk'"

doc/administration/clusters/kas.md

@@ -6,13 +6,13 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 
 # Install the GitLab Agent Server (KAS) **(FREE SELF)**
 
+> - [Introduced](https://gitlab.com/groups/gitlab-org/-/epics/3834) in GitLab 13.10, the GitLab Agent Server (KAS) became available on GitLab.com under `wss://kas.gitlab.com`.
 > [Moved](https://gitlab.com/groups/gitlab-org/-/epics/6290) from GitLab Premium to GitLab Free in 14.5.
 
 The GitLab Agent Server (KAS) is a GitLab backend service dedicated to
 managing the [GitLab Agent](../../user/clusters/agent/index.md).
 
 The KAS is already installed and available in GitLab.com under `wss://kas.gitlab.com`.
-See [how to use GitLab.com's KAS](../../user/clusters/agent/install/index.md#set-up-the-agent-server).
 This document describes how to install a KAS for GitLab self-managed instances.
 
 ## Installation options

doc/user/clusters/agent/ci_cd_tunnel.md

@@ -19,11 +19,8 @@ Only CI/CD jobs set in the configuration project can access one of the configure
 
 ## Prerequisites
 
-- A running [`kas` instance](install/index.md#set-up-the-agent-server).
-- A [configuration repository](install/index.md#define-a-configuration-repository) with an agent config file
-  installed (`.gitlab/agents/<agent-name>/config.yaml`).
-- A [registered agent](install/index.md#register-an-agent-with-gitlab).
-- The agent [installed in the cluster](install/index.md#install-the-agent-into-the-cluster).
+- An existing Kubernetes cluster.
+- An agent [installed on your cluster](install/index.md#install-the-agent-into-the-cluster).
 
 ## Use the CI/CD Tunnel to run Kubernetes commands from GitLab CI/CD