docs(cdk-ops): link to Redshift admin info

- `docs/data-warehouse` includes a link to the section that explains how
  to deal with the situation where the AWS Secrets Manager regenarates
  the admin secret.

issue codemonger-io#30

cdk-ops/docs/data-warehouse.ja.md

@@ -86,7 +86,7 @@ Lambda関数([`PopulateDwDatabase`](#populatedwdatabase), [`LoadAccessLogs`](#lo
 [*AWS Secrets Manager User Guide*](https://docs.aws.amazon.com/secretsmanager/latest/userguide/intro.html)もご参照ください。
 
 残念ながら、`AWS Secrets Manager`が管理するシークレットは[`Amazon Redshift Serverless`](#amazon-redshift-serverless)の管理パスワードと同期していません(初回生成時を除く)。
-なので`AWS Secrets Manager`が新しいシークレットを生成してしまった際には、[`Amazon Redshift Serverless`](#amazon-redshift-serverless)の管理パスワードを手作業でリセットしなければなりません。
+なので`AWS Secrets Manager`が新しいシークレットを生成してしまった際には、[`Amazon Redshift Serverless`](#amazon-redshift-serverless)の管理パスワードを手作業でリセットしなければなりません(対処方法は[READMEの「Amazon Redshift Serverlessネームスペースの管理ユーザー」](../README.ja.md#amazon-redshift-serverlessネームスペースの管理ユーザー)をご参照ください)。
 
 ### Amazon Redshift Data API
 

cdk-ops/docs/data-warehouse.md

@@ -86,7 +86,7 @@ Please refer to ["Enhanced VPC routing in Amazon Redshift" - *Amazon Redshift Ma
 Please also refer to [*AWS Secrets Manager User Guide*](https://docs.aws.amazon.com/secretsmanager/latest/userguide/intro.html).
 
 Unfortunately, the secret managed by `AWS Secrets Manager` does not sync with the admin password of [`Amazon Redshift Serverless`](#amazon-redshift-serverless) except for the first time it is generated.
-So you have to manually reset the admin password of [`Amazon Redshift Serverless`](#amazon-redshift-serverless) in case `AWS Secrets Manager` generates a new secret.
+So you have to manually reset the admin password of [`Amazon Redshift Serverless`](#amazon-redshift-serverless) in case `AWS Secrets Manager` generates a new secret; please refer to ["Admin user of the Amazon Redshift Serverless namespace" in *README*](../README.md#admin-user-of-the-amazon-redshift-serverless-namespace) for how to deal with it.
 
 ### Amazon Redshift Data API