Updates the Suspend Backups description (#20575)

Author: SaurabhSharma-MSFT

specification/dataprotection/resource-manager/Microsoft.DataProtection/stable/2022-05-01/dataprotection.json

@@ -1922,7 +1922,7 @@
         "tags": [
           "BackupInstances"
         ],
-        "description": "This operation will stop backups for backup instance",
+        "description": "This operation will stop backup for a backup instance and retains the backup data as per the policy (except latest Recovery point, which will be retained forever)",
         "operationId": "BackupInstances_SuspendBackups",
         "produces": [
           "application/json"