[docs] vDB PostgreSQL — Logical Replication & CDC activation grants existing admin account — VI + EN

[greennode-vdb]

Follow-up to #14. Activation is manual (contact Support) and grants REPLICATION plus other necessary privileges directly to the cluster's existing admin account — no separate replication user is created, since the self-service portal toggle isn't built yet.

• Removed the "Grant CREATE on Schema and Target Database" step (no longer needed once privileges go directly to the admin account) and renumbered subsequent steps
• Clarified that the CONNECTION string's user/password is the Publisher's account, distinct from the Subscriber account used to run CREATE SUBSCRIPTION
• Restructured Subscriber table-creation into two clearly-labeled methods (manual vs pg_dump), warning moved up-front
• Trimmed redundant/inconsistent copy (duplicate restart-batching sentence, verbose placeholders)

Files:

• Vietnamese/vdb/relational-database-service-rds/postgresql/cau-hinh-logical-replication.md
• Vietnamese/vdb/relational-database-service-rds/postgresql/thiet-lap-cdc-voi-debezium.md
• English/vdb/relational-database-service-rds/postgresql/configure-logical-replication.md
• English/vdb/relational-database-service-rds/postgresql/set-up-cdc-with-debezium.md