[Docs] aws_ecs_cluster: Correct documentation to use KMS ARN instead of KMS ID in Fargate Storage configuration

[tabito-hara]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Description

According to the current acceptance test implementation, configuration.managed_storage_configuration.fargate_ephemeral_storage_kms_key_id in aws_ecs_cluster resource is expected to be a KMS ARN, not a KMS ID, as #45545 reported.

See:

terraform-provider-aws/internal/service/ecs/cluster_test.go

Lines 348 to 357 in a4196fb

	{
	Config: testAccClusterConfig_managedStorageConfiguration(rName, "aws_kms_key.test.arn", "null"),
	Check: resource.ComposeTestCheckFunc(
	testAccCheckClusterExists(ctx, resourceName, &cluster1),
	resource.TestCheckResourceAttr(resourceName, "configuration.#", "1"),
	resource.TestCheckResourceAttr(resourceName, "configuration.0.managed_storage_configuration.#", "1"),
	resource.TestCheckResourceAttrPair(resourceName, "configuration.0.managed_storage_configuration.0.fargate_ephemeral_storage_kms_key_id", "aws_kms_key.test", names.AttrARN),
	resource.TestCheckResourceAttr(resourceName, "configuration.0.managed_storage_configuration.0.kms_key_id", ""),
	),
	},

The same applies to the kms_key_id attribute in this block as well:

terraform-provider-aws/internal/service/ecs/cluster_test.go

Lines 364 to 373 in a4196fb

	{
	Config: testAccClusterConfig_managedStorageConfiguration(rName, "null", "aws_kms_key.test.arn"),
	Check: resource.ComposeTestCheckFunc(
	testAccCheckClusterExists(ctx, resourceName, &cluster1),
	resource.TestCheckResourceAttr(resourceName, "configuration.#", "1"),
	resource.TestCheckResourceAttr(resourceName, "configuration.0.managed_storage_configuration.#", "1"),
	resource.TestCheckResourceAttr(resourceName, "configuration.0.managed_storage_configuration.0.fargate_ephemeral_storage_kms_key_id", ""),
	resource.TestCheckResourceAttrPair(resourceName, "configuration.0.managed_storage_configuration.0.kms_key_id", "aws_kms_key.test", names.AttrARN),
	),
	},

This PR updates the documentation including the example and description of fargate_ephemeral_storage_kms_key_id and kms_key_id in configuration.managed_storage_configuration block.

Relations

Closes #45545

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[ewbankkit]

LGTM 🚀.

[ewbankkit]

@tabito-hara Thanks for the contribution 🎉 👏.

[github-actions]

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