[patch] added tech note for manage 90x-91x upgrad issue (#482)

Author: Abhishekkushawaha

src/mas/devops/data/catalogs/v9-260827-amd64.yaml

@@ -223,4 +223,4 @@ editorial:
     - OCP: 4.22
     - Mongo: 8.0.29
   known_issues:
-    - title: 
+    - title: During upgrades from MAS Manage 9.0.x to 9.1.x using the online-offline upgrade process, some environments may fail during the offline phase because the PLGCOUNT table does not contain the expected MAXPRODUCTID column. This issue is upgrade-blocking and was identified late in the release validation cycle. Due to the August 27, 2026 GA release timeline, MAS Manage 9.1.x was released with this documented as a known limitation. A corrective fix has been developed, and an Interim Fix (IFIX) release is being prepared. Customers encountering this issue should contact IBM Support and reference the [technote](https://www.ibm.com/support/pages/node/7285399)

src/mas/devops/data/catalogs/v9-260827-ppc64le.yaml

@@ -82,4 +82,4 @@ editorial:
     - OCP: 4.22
     - Mongo: 8.0.29
   known_issues:
-    - title: 
+    - title: During upgrades from MAS Manage 9.0.x to 9.1.x using the online-offline upgrade process, some environments may fail during the offline phase because the PLGCOUNT table does not contain the expected MAXPRODUCTID column. This issue is upgrade-blocking and was identified late in the release validation cycle. Due to the August 27, 2026 GA release timeline, MAS Manage 9.1.x was released with this documented as a known limitation. A corrective fix has been developed, and an Interim Fix (IFIX) release is being prepared. Customers encountering this issue should contact IBM Support and reference the technote [technote](https://www.ibm.com/support/pages/node/7285399)

src/mas/devops/data/catalogs/v9-260827-s390x.yaml

@@ -82,5 +82,5 @@ editorial:
     - OCP: 4.22
     - Mongo: 8.0.29
   known_issues:
-    - title: 
+    - title: During upgrades from MAS Manage 9.0.x to 9.1.x using the online-offline upgrade process, some environments may fail during the offline phase because the PLGCOUNT table does not contain the expected MAXPRODUCTID column. This issue is upgrade-blocking and was identified late in the release validation cycle. Due to the August 27, 2026 GA release timeline, MAS Manage 9.1.x was released with this documented as a known limitation. A corrective fix has been developed, and an Interim Fix (IFIX) release is being prepared. Customers encountering this issue should contact IBM Support and reference the technote [technote](https://www.ibm.com/support/pages/node/7285399)