Adds docs about how to find the cluster section

- inform about project clusters
- inform about group clusters
- inform about instance clusters

doc/user/group/clusters/index.md

@@ -14,6 +14,9 @@ Similar to [project-level](../../project/clusters/index.md) and
 group-level Kubernetes clusters allow you to connect a Kubernetes cluster to
 your group, enabling you to use the same cluster across multiple projects.
 
+To view your group level Kubernetes clusters, navigate to your project and select
+**Kubernetes** from the left-hand menu.
+
 ## Installing applications
 
 GitLab can install and manage some applications in your group-level

doc/user/instance/clusters/index.md

@@ -10,6 +10,8 @@ instance-level Kubernetes clusters allow you to connect a Kubernetes cluster to
 the GitLab instance, which enables you to use the same cluster across multiple
 projects.
 
+The instance level Kubernetes clusters can be found in the top menu by navigating to your instance's **{admin}** **Admin Area > Kubernetes**.
+
 ## Cluster precedence
 
 GitLab will try to match clusters in the following order:

doc/user/project/clusters/index.md

@@ -31,6 +31,11 @@ Besides integration at the project level, Kubernetes clusters can also be
 integrated at the [group level](../../group/clusters/index.md) or
 [GitLab instance level](../../instance/clusters/index.md).
 
+To view your project level Kubernetes clusters, navigate to **Operations > Kubernetes**
+from your project. On this page, you can [add a new cluster](#adding-and-removing-clusters)
+and view information about your existing clusters, such as nodes count and rough estimates
+of memory and CPU usage.
+
 ## Setting up
 
 ### Supported cluster versions