Doc for tanzu cli upgrade (#4307) (#4316)

* add doc for tanzu cli upgrade
Signed-off-by: kcoriordan <koriordan@vmware.com>

* fix mdlint issues
Signed-off-by: kcoriordan <koriordan@vmware.com>
(cherry picked from commit f59467c1

)
Co-authored-by: Kay ORiordan <koriordan@vmware.com>

docs/site/content/docs/cli-uninstall.md

@@ -2,6 +2,8 @@
 
 Complete the following steps to uninstall the Tanzu CLI and any associated configurations.
 
+**Warning**: Uninstalling the Tanzu CLI will delete access to any managed or unmanaged clusters that were deployed with the Tanzu CLI.
+
 ## Linux
 
 1. Run the following command to uninstall the Tanzu CLI:

docs/site/content/docs/cli-upgrade.md

+# Upgrade the Tanzu CLI
+
+Complete the following steps to upgrade the Tanzu CLI:
+
+1. Follow the instructions in [Install Tanzu CLI](cli-installation) to download and install the latest version of the Tanzu CLI. This will overwrite your previous installation of Tanzu CLI.
+
+1. (Optional) If you have running managed clusters on Amazon, Azure or vSphere, see [Upgrade Management & Workload Cluster](upgrade-managed) for steps on how to upgrade the Cluster API and Kubernetes version.

docs/site/data/docs/main-toc.yml

@@ -15,12 +15,14 @@ toc:
           url: /getting-started
         - page: Deploy Unmanaged Clusters
           url: /getting-started-unmanaged
-    - title: Installation
+    - title: Installation & Upgrade
       subfolderitems:
         - page: Plan Your Installation
           url: /installation-planning
         - page: Install the Tanzu CLI
           url: /cli-installation
+        - page: Upgrade the Tanzu CLI
+          url: /cli-upgrade
         - page: AWS
           url: /aws-intro
           subitems: