doc(upgrade): auto image cleanup not working in some upgrade paths

Adding notes about the automatic image cleanup issue for the following upgrade paths:
- Upgrading from v1.3.1 to v1.3.2
- Upgrading from v1.2.2 to v1.3.1

Signed-off-by: Zespre Chang <zespre.chang@suse.com>
Co-authored-by: Jillian <67180770+jillian-maroket@users.noreply.github.com>

docs/upgrade/v1-2-2-to-v1-3-1.md

@@ -87,3 +87,9 @@ To resolve this issue, perform the following steps:
   - [[BUG] Upgrade v1.2.2->v1.3.1 stuck at Waiting for kubelet to update, even the node has been updated](https://github.com/harvester/harvester/issues/6041)
 
 ---
+
+### 2. Automatic image cleanup is not functioning
+
+Because the published Harvester ISO contains an incomplete image list, automatic image cleanup cannot be performed during an upgrade from v1.2.2 to v1.3.1. This issue does not block the upgrade, and you can use [this script](https://github.com/harvester/upgrade-helpers/blob/main/bin/harv-purge-images.sh) to manually clean up container images after the upgrade is completed. For more information, see [issue #6620](https://github.com/harvester/harvester/issues/6620).
+
+---

docs/upgrade/v1-3-1-to-v1-3-2.md

@@ -220,3 +220,9 @@ If the kubectl command does not return a response, the kubelet is unable to acce
 For more information, see [Issue #6432](https://github.com/harvester/harvester/issues/6432#issuecomment-2325488465).
 
 ---
+
+### 2. Automatic image cleanup is not functioning
+
+Because the published Harvester ISO contains an incomplete image list, automatic image cleanup cannot be performed during an upgrade from v1.3.1 to v1.3.2. This issue does not block the upgrade, and you can use [this script](https://github.com/harvester/upgrade-helpers/blob/main/bin/harv-purge-images.sh) to manually clean up container images after the upgrade is completed. For more information, see [issue #6620](https://github.com/harvester/harvester/issues/6620).
+
+---

versioned_docs/version-v1.3/upgrade/v1-2-2-to-v1-3-1.md

@@ -87,3 +87,9 @@ To resolve this issue, perform the following steps:
   - [[BUG] Upgrade v1.2.2->v1.3.1 stuck at Waiting for kubelet to update, even the node has been updated](https://github.com/harvester/harvester/issues/6041)
 
 ---
+
+### 2. Automatic image cleanup is not functioning
+
+Because the published Harvester ISO contains an incomplete image list, automatic image cleanup cannot be performed during an upgrade from v1.2.2 to v1.3.1. This issue does not block the upgrade, and you can use [this script](https://github.com/harvester/upgrade-helpers/blob/main/bin/harv-purge-images.sh) to manually clean up container images after the upgrade is completed. For more information, see [issue #6620](https://github.com/harvester/harvester/issues/6620).
+
+---

versioned_docs/version-v1.3/upgrade/v1-3-1-to-v1-3-2.md

@@ -220,3 +220,9 @@ If the kubectl command does not return a response, the kubelet is unable to acce
 For more information, see [Issue #6432](https://github.com/harvester/harvester/issues/6432#issuecomment-2325488465).
 
 ---
+
+### 2. Automatic image cleanup is not functioning
+
+Because the published Harvester ISO contains an incomplete image list, automatic image cleanup cannot be performed during an upgrade from v1.3.1 to v1.3.2. This issue does not block the upgrade, and you can use [this script](https://github.com/harvester/upgrade-helpers/blob/main/bin/harv-purge-images.sh) to manually clean up container images after the upgrade is completed. For more information, see [issue #6620](https://github.com/harvester/harvester/issues/6620).
+
+---