docs: [aws_rds_cluster] Change the sample string for the Master Password

[kuredev]

Description

This Pull Request is to edit the following document:
https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/rds_cluster.html

In the current document example, the master password is set to "bar".

However, according to AWS specifications, the master password must be at least 8 characters long, which causes an error during terraform apply.

Must contain from 8 to 41 characters.
https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_CreateDBCluster.html

Error during terraform apply

aws_rds_cluster.postgresql: Creating...
╷
│ Error: creating RDS Cluster (aurora-cluster-demo): InvalidParameterValue: The parameter MasterUserPassword is not a valid password because it is shorter than 8 characters.

Output from Acceptance Testing

There are no changes to the source code.

[github-actions]

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[ewbankkit]

LGTM 🚀.

[ewbankkit]

@kuredev Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v5.59.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!