docs(stepfunctions-tasks): description for ecs run task with imported

[bun913]

Summary

This PR...

• Improves the documentation for aws-stepfunctions-tasks.EcsRunTask

Motivation

• As mentioned in stepfunctions-tasks: run ecs task can use CustomState #24097 , an imported taskdefinition cannot use the Construct of EcsRuntask.
• However, the current documentation does not specify an alternative, which may lead to a wrong understanding that L1 Construct may have to be used.
• In fact, we would like to clarify that it is generally possible by using CustomState(L2 Construct)

Closes #24097

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[gitpod-io]

[aws-cdk-automation]

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[TheRealAmazonKendra]

Don't merge manually. It dismisses our reviews. You can use @Mergifyio update to update the PR, but even that isn't necessary because it's put in the merge train after approval.

[bun913]

@TheRealAmazonKendra

Sorry. I accidentally pressed the wrong button.
I will be careful from now on.

[TheRealAmazonKendra]

No big deal in this case. I'll re-approve, but it will remove our approval every time.

[bun913]

@TheRealAmazonKendra

OK. I understand.
I will wait for a while.

[TheRealAmazonKendra]

@TheRealAmazonKendra

Sorry. I accidentally pressed the wrong button. I will be careful from now on.

No worries, totally happens. Thanks again for the contribution!

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

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• Commit ID: 06eef2f
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).