Updated the RELEASE-NOTES.md file

doc/release/RELEASE-NOTES.md

@@ -13,7 +13,7 @@ This project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html
 * [OSDEV-1514](https://opensupplyhub.atlassian.net/browse/OSDEV-1514) - Upgraded the PostgreSQL version from 12 to 13 for the database used in local development, DB anonymization, DB restore setup, and environments in the AWS cloud. Additionally, the postgis and pg_trgm extensions have been upgraded to versions 3.4.2 and 1.5, respectively, based on the available extension versions for PostgreSQL 13.15 in AWS RDS. For more information, see [Extensions supported for RDS for PostgreSQL 13](https://docs.aws.amazon.com/AmazonRDS/latest/PostgreSQLReleaseNotes/postgresql-extensions.html#postgresql-extensions-13x). Allowed major version upgrades and activated the `apply immediately` flag to perform the PostgreSQL major version upgrade in AWS.
 
 #### Migrations:
-* 0163_upgrade_postgres_extensions.py - This migration refreshes the `pg_statistic` table after the upgrade to PostgreSQL 13 and upgrades the postgis and pg_trgm extensions to versions 3.4.2 and 1.5, respectively.
+* 0163_refresh_pg_statistic_and_upgrade_postgres_extensions.py - This migration refreshes the `pg_statistic` table after the upgrade to PostgreSQL 13 and upgrades the postgis and pg_trgm extensions to versions 3.4.2 and 1.5, respectively.
 
 #### Schema changes
 
@@ -48,6 +48,10 @@ This project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html
 * Ensure that the following commands are included in the `post_deployment` command:
     * `migrate`
     * `reindex_database`
+* This release will upgrade PostgreSQL from version 12 to version 13.
+    * The upgrade will be performed automatically by Terrafrom and AWS, but some steps need to be completed **before** and **after** the upgrade. Please refer to [the Confluence article](https://opensupplyhub.atlassian.net/wiki/spaces/SD/pages/620134402/PostgreSQL+database+upgrade+from+version+12+to+version+13) for detailed instructions.
+    * Steps to be completed before the upgrade are marked with the statement: "**This should be done before deploying the upgraded database.**". Post-upgrade tasks can be found under the [After the PostgreSQL major version upgrade](https://opensupplyhub.atlassian.net/wiki/spaces/SD/pages/620134402/PostgreSQL+database+upgrade+from+version+12+to+version+13#After-the-PostgreSQL-major-version-upgrade) section.
+    * In case of an unsuccessful release along with the database upgrade, follow the instructions under the [Guide for rolling back the PostgreSQL major version upgrade](https://opensupplyhub.atlassian.net/wiki/spaces/SD/pages/620134402/PostgreSQL+database+upgrade+from+version+12+to+version+13#Guide-for-rolling-back-the-PostgreSQL-major-version-upgrade) section.
 
 
 ## Release 1.27.0