Merge branch 'docs-add-existing-cluster-fixup' into 'master'

Docs: Improve add existing cluster section

See merge request gitlab-org/gitlab-ce!26266

doc/user/project/clusters/index.md

@@ -101,6 +101,12 @@ To add an existing Kubernetes cluster to your project:
       It's the URL that GitLab uses to access the Kubernetes API. Kubernetes
       exposes several APIs, we want the "base" URL that is common to all of them,
       e.g., `https://kubernetes.example.com` rather than `https://kubernetes.example.com/api/v1`.
+
+      Get the API URL by running this command:
+
+      ```sh
+      kubectl cluster-info | grep 'Kubernetes master' | awk '/http/ {print $NF}'
+      ```
     - **CA certificate** (required) - A valid Kubernetes certificate is needed to authenticate to the EKS cluster. We will use the certificate created by default.
       - List the secrets with `kubectl get secrets`, and one should named similar to
        `default-token-xxxxx`. Copy that token name for use below.
@@ -124,23 +130,7 @@ To add an existing Kubernetes cluster to your project:
           metadata:
             name: gitlab-admin
             namespace: kube-system
-          ```
-
-      2. Apply the service account to your cluster:
-
-          ```bash
-          kubectl apply -f gitlab-admin-service-account.yaml
-          ```
-
-          Output:
-
-            ```bash
-            serviceaccount "gitlab-admin" created
-            ```
-
-      3. Create a file called `gitlab-admin-cluster-role-binding.yaml` with contents:
-
-          ```yaml
+          ---
           apiVersion: rbac.authorization.k8s.io/v1beta1
           kind: ClusterRoleBinding
           metadata:
@@ -155,19 +145,20 @@ To add an existing Kubernetes cluster to your project:
             namespace: kube-system
           ```
 
-      4. Apply the cluster role binding to your cluster:
+      1. Apply the service account and cluster role binding to your cluster:
 
           ```bash
-          kubectl apply -f gitlab-admin-cluster-role-binding.yaml
+          kubectl apply -f gitlab-admin-service-account.yaml
           ```
 
           Output:
 
           ```bash
+          serviceaccount "gitlab-admin" created
           clusterrolebinding "gitlab-admin" created
           ```
 
-      5. Retrieve the token for the `gitlab-admin` service account:
+      1. Retrieve the token for the `gitlab-admin` service account:
 
           ```bash
           kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep gitlab-admin | awk '{print $1}')
@@ -212,14 +203,6 @@ To add an existing Kubernetes cluster to your project:
 After a couple of minutes, your cluster will be ready to go. You can now proceed
 to install some [pre-defined applications](#installing-applications).
 
-To determine the:
-
-- API URL, run `kubectl cluster-info | grep 'Kubernetes master' | awk '/http/ {print $NF}'`.
-- Token:
-  1. List the secrets by running: `kubectl get secrets`. Note the name of the secret you need the token for.
-  1. Get the token for the appropriate secret by running: `kubectl get secret <SECRET_NAME> -o jsonpath="{['data']['token']}" | base64 --decode`.
-- CA certificate, run `kubectl get secret <secret name> -o jsonpath="{['data']['ca\.crt']}" | base64 --decode`.
-
 ## Security implications
 
 CAUTION: **Important:**