[2.9.0] Add known bugs section in Helm Charts page (#1384)

* Add known bugs section in Helm Charts page

* attempt at revising explanation

* on a cluster

* Apply suggestions from code review

* Update versioned_docs/version-2.9/how-to-guides/new-user-guides/helm-charts-in-rancher/helm-charts-in-rancher.md

Co-authored-by: Marty Hernandez Avedon <marty.avedon@suse.com>

* Update versioned_docs/version-2.9/how-to-guides/new-user-guides/helm-charts-in-rancher/helm-charts-in-rancher.md

* Update versioned_docs/version-2.9/how-to-guides/new-user-guides/helm-charts-in-rancher/helm-charts-in-rancher.md

* Apply 15186406..8efd3638 (Add known bugs section in Helm Charts page) to /docs

---------

Co-authored-by: martyav <marty.avedon@suse.com>
Co-authored-by: Billy Tat <btat@suse.com>

docs/how-to-guides/new-user-guides/helm-charts-in-rancher/helm-charts-in-rancher.md

@@ -241,4 +241,9 @@ To upgrade legacy multi-cluster apps:
 
 ## Limitations
 
-Dashboard apps or Rancher feature charts can't be installed using the Rancher CLI.
+- Dashboard apps or Rancher feature charts can't be installed using the Rancher CLI.
+
+- When determining the most recent version to display for the **Upgradable** column on the **Apps > Installed Apps** page, rather than only considering versions of the Helm chart from the repository it was installed from, Rancher considers versions of the Helm chart from all repositories on the cluster.
+
+  For example, suppose you install `cert-manager` v1.13.0 from repository A, where v1.14.0 is now the most recent version available. In this case, you expect **Upgradable** to display v1.14.0. However, if the cluster also has access to repository B where v1.15.0 of `cert-manager` is available, then **Upgradable** displays v1.15.0 even though the original installation used repository A.
+  

versioned_docs/version-2.9/how-to-guides/new-user-guides/helm-charts-in-rancher/helm-charts-in-rancher.md

@@ -241,4 +241,8 @@ To upgrade legacy multi-cluster apps:
 
 ## Limitations
 
-Dashboard apps or Rancher feature charts can't be installed using the Rancher CLI.
+- Dashboard apps or Rancher feature charts can't be installed using the Rancher CLI.
+
+- When determining the most recent version to display for the **Upgradable** column on the **Apps > Installed Apps** page, rather than only considering versions of the Helm chart from the repository it was installed from, Rancher considers versions of the Helm chart from all repositories on the cluster.
+
+  For example, suppose you install `cert-manager` v1.13.0 from repository A, where v1.14.0 is now the most recent version available. In this case, you expect **Upgradable** to display v1.14.0. However, if the cluster also has access to repository B where v1.15.0 of `cert-manager` is available, then **Upgradable** displays v1.15.0 even though the original installation used repository A.