examples: configuration for intra-region Transit Gateway Peering

[gmichelo]

Issue #23828 made me think that the intra-region Peering use-case
is not straight forward. Operators might assume they need to
configure the Acceptor to the Peering Attachment that Terraform creates.
In fact, AWS creates two Peering Attachment resources, one for the
Creator side and one for the Acceptor side. So, the a Data Source
is needed to find the second Acceptor side's attachment and then
use it to configure the Acceptor resource.

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Closes #23828

Output from acceptance testing: not needed as it's a new example config and not a code change.

[github-actions]

Welcome @BigMikes 👋

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[justinretzolk]

Hey @BigMikes 👋 Thank you for taking the time to raise this! I added a few comments, mostly around some typos and whitespace issues.

[justinretzolk]

LGTM! Thank you again for your contribution!

[github-actions]

This functionality has been released in v4.22.0 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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