aws_db_instance: call out write-only attribute

website/docs/r/db_instance.html.markdown

@@ -374,7 +374,7 @@ Supported in Amazon RDS](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/
 * `option_group_name` - (Optional) Name of the DB option group to associate.
 * `parameter_group_name` - (Optional) Name of the DB parameter group to associate.
 * `password` - (Optional required unless `manage_master_user_password` is set to true, `snapshot_identifier`, `replicate_source_db`, or `password_wo` is provided) Password for the master DB user. Note that this may show up in logs, and it will be stored in the state file. Cannot be set if `manage_master_user_password` is set to `true`.
-* `password_wo` - (Optional required unless `manage_master_user_password` is set to true, `snapshot_identifier`, `replicate_source_db`, or `password` is provided) Password for the master DB user. Note that this may show up in logs, and it will be stored in the state file. Cannot be set if `manage_master_user_password` is set to `true`.
+* `password_wo` - (Optional, Write-Only required unless `manage_master_user_password` is set to true, `snapshot_identifier`, `replicate_source_db`, or `password` is provided) Password for the master DB user. Note that this may show up in logs, and it will be stored in the state file. Cannot be set if `manage_master_user_password` is set to `true`.
 * `password_wo_version` - (Optional) Used together with `password_wo` to trigger an update. Increment this value when an update to the `password_wo` is required.
 * `performance_insights_enabled` - (Optional) Specifies whether Performance Insights are enabled. Defaults to false.
 * `performance_insights_kms_key_id` - (Optional) The ARN for the KMS key to encrypt Performance Insights data. When specifying `performance_insights_kms_key_id`, `performance_insights_enabled` needs to be set to true. Once KMS key is set, it can never be changed.