docs: add limitation for external registry + content bundle

docs/docs-content/clusters/edge/edge-configuration/installer-reference.md

@@ -42,6 +42,11 @@ listed in alphabetical order.
 You can point the Edge Installer to a non-default registry to load content from another source. Use the
 `registryCredentials` parameter object to specify the registry configurations.
 
+If you are using an external registry and want to use content bundles when deploying your Edge cluster, you must also
+enable the local Harbor registry. For more information, refer to
+[Build Content Bundles](../edgeforge-workflow/palette-canvos/build-content-bundle.md) and
+[Enable Local Harbor Registry](../site-deployment/deploy-custom-registries/local-registry.md).
+
 | Parameter                                    | Description                                                                                                                                                                                                                                                                                                   | Default |
 | -------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------- |
 | `stylus.registryCredentials.domain`          | The domain of the registry. You can use an IP address plus the port or a domain name.                                                                                                                                                                                                                         |         |

docs/docs-content/clusters/edge/edgeforge-workflow/palette-canvos/build-content-bundle.md

@@ -41,6 +41,15 @@ Creating a content bundle provides several benefits that may address common use
 - Organizations that want better control over the software used by their Edge hosts can use content bundles to ensure
   that only approved software is consumed.
 
+## Limitation
+
+- You cannot use content bundles with an external registry if you do not enable the local Harbor registry on your Edge
+  host. If you specify a external registry without enabling the local Harbor registry, the images will be downloaded
+  from the external registry even if you provide a content bundle, and deployment will fail if the necessary images
+  cannot be located in the external registry. For more information, refer to
+  [Deploy Cluster with External Registry](../../site-deployment/deploy-custom-registries/deploy-external-registry.md)
+  and [Enable Local Harbor Registry](../../site-deployment/deploy-custom-registries/local-registry.md).
+
 ## Prerequisites
 
 - Linux Machine (Physical or VM) with an AMD64 architecture.

docs/docs-content/clusters/edge/site-deployment/deploy-custom-registries/deploy-external-registry.md

@@ -38,6 +38,13 @@ information, refer to [Enable Local Harbor Registry](./local-registry.md).
 - Palette Edge supports basic username/password authentication. Token authentication schemes used by services such as
   AWS ECR and Google Artifact Registry are not supported.
 
+- You cannot use content bundles with an external registry if you do not enable the local Harbor registry on your Edge
+  host. If you specify a external registry without enabling the local Harbor registry, the images will be downloaded
+  from the external registry even if you provide a content bundle, and deployment will fail if the necessary images
+  cannot be located in the external registry. For more information, refer to
+  [Build Content Bundles](../../edgeforge-workflow/palette-canvos/build-content-bundle.md) and
+  [Enable Local Harbor Registry](../../site-deployment/deploy-custom-registries/local-registry.md).
+
 ## Prerequisites
 
 - Specifying the external registry and providing credentials happens during the EdgeForge process. You should become