Add description: lb_target_group_attachment for target type alb

[Shunpoco]

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Information

Thanks to #21069, we can target an ALB.
But in the current document of target_group_attachment, there is no explanation of how to attach ALB in a target_id.

Output from acceptance testing: NA, docs

[github-actions]

Welcome @Shunpoco 👋

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[breathingdust]

LGTM 🚀 Thanks @Shunpoco!

[github-actions]

This functionality has been released in v3.66.0 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!

[github-actions]

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