Updates an Amazon RDS instance.
See https://www.paws-r-sdk.com/docs/opsworks_update_rds_db_instance/ for full documentation.
opsworks_update_rds_db_instance(
RdsDbInstanceArn,
DbUser = NULL,
DbPassword = NULL
)
[required] The Amazon RDS instance's ARN.
The master user name.
The database password.