Update docs/admin/how-to/upgrade-postgres-12-16-builtin-dbs.mdx

Co-authored-by: Louis Jarvis <[email protected]>

Author: DaedalusG

docs/admin/how-to/upgrade-postgres-12-16-builtin-dbs.mdx

@@ -82,7 +82,9 @@ $ kubectl apply -f deploy-sourcegraph-k8s/base/sourcegraph/pgsql/pgsql.StatefulS
 
 ## Helm
 
-Unlike other deployment methods, Helm charts function as a complete unit and don't allow upgrading only the database components independently. Therefore, the PostgreSQL upgrade must be performed as part of a full Sourcegraph version upgrade.
+When using the in-cluster PostgreSQL databases included in the Sourcegraph Helm chart, database upgrades are integrated with the overall application upgrade process and there is no mechanism to upgrade only the PostgreSQL containers independently. Therefore, the PostgreSQL upgrade must be performed as part of a full Sourcegraph version upgrade.
+
+For production deployments, we recommend using external PostgreSQL databases, which allows for more flexible database management outside the Helm deployment lifecycle.
 
 ### Required Upgrade Path