Update README.md

Author: ting-lan-wang

README.md

@@ -27,7 +27,7 @@ Oracle will continue to extend `OraOperator` to support additional Oracle Databa
 * TCPS support customer provided certs
 * Execute custom scripts during DB setup/startup
 * Patching for SIDB Primary/Standby in Data Guard
-* Long-term backup for Autonomous Databases (ADB): Moves to long-term backup and removes the deprecated mandatory backup
+* Long-term backup for Autonomous Databases (ADB): Support for [long-term retention backup](https://docs.oracle.com/en/cloud/paas/autonomous-database/serverless/adbsb/backup-long-term.html) and removed support for the deprecated mandatory backup
 * Wallet expiry date for ADB: A user-friendly enhancement to display the wallet expiry date in the status of the associated ADB
 * Wait-for-Completion option for ADB: Supports `kubectl wait` command that allows the user to wait for a specific condition on ADB
 * OKE workload Identify: Supports OKE workload identity authentication method (i.e., uses OKE credentials). For more details, refer to [Oracle Autonomous Database (ADB) Prerequisites](docs/adb/ADB_PREREQUISITES.md#authorized-with-oke-workload-identity)