docs: update the usage of the attachment submodule

[ocofaigh]

Description

Updating the usage based on consumer feedback

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• If relevant, a test for the change is included or updated with this PR.
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[ocofaigh]

/run pipeline

[ocofaigh]

@jor2 can you please review?

[terraform-ibm-modules-ops]

🎉 This PR is included in version 1.8.28 🎉

The release is available on GitHub release

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