Merge branch 'docs-update-CI-apps' into 'master'

Adds clarifications about CI apps

See merge request gitlab-org/gitlab!27388

doc/user/clusters/applications.md

@@ -588,6 +588,15 @@ output of the [Helm
 Tiller](https://v2.helm.sh/docs/install/#running-tiller-locally) binary
 will be saved as a [CI job artifact](../../ci/pipelines/job_artifacts.md).
 
+### Important notes
+
+Note the following:
+
+- When you set the value for `installed` key back to `false`, the application will be
+  unprovisioned from the cluster.
+- If you update `.gitlab/managed-apps/<application>/values.yaml` with new values, the
+  application will be redeployed.
+
 ### Install Ingress using GitLab CI
 
 To install Ingress, define the `.gitlab/managed-apps/config.yaml` file

doc/user/clusters/management_project.md

@@ -14,7 +14,7 @@ privileges.
 
 This can be useful for:
 
-- Creating pipelines to install cluster-wide applications into your cluster.
+- Creating pipelines to install cluster-wide applications into your cluster, see [Install using GitLab CI (alpha)](applications.md#install-using-gitlab-ci-alpha) for details.
 - Any jobs that require `cluster-admin` privileges.
 
 ## Permissions
@@ -47,6 +47,8 @@ To select a cluster management project to use:
      **Operations > Kubernetes** page.
    - [Group-level cluster](../group/clusters/index.md), navigate to your group's **Kubernetes**
      page.
+   - [Instance-level cluster](../instance/clusters/index.md), navigate to Admin Area's **Kubernetes**
+     page.
 1. Select the project using **Cluster management project field** in the **Advanced settings**
    section.