docs: nest role_arn under assume_role

[kyledecot]

what

Fixes minor error w/ docs so that role_arn is properly nested under assume_role.

why

Docs incorrectly had role_arn at the top-level of s3 backend configuration.

references

https://developer.hashicorp.com/terraform/language/backend/s3

Summary by CodeRabbit

Release Notes

• Documentation
  • Updated Terraform S3 backend configuration examples to reflect the new nested assume_role structure for specifying IAM role access.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Documentation update to Terraform S3 backend configuration examples. The role_arn parameter is relocated from the top level of the backend.s3 block into a nested assume_role object containing role_arn, applied across two YAML configuration samples.

Changes

Cohort / File(s)	Summary
Terraform Backend Documentation website/docs/components/terraform/remote-state.mdx	Updated S3 backend IAM role configuration in two examples: moved role_arn from backend.s3.role_arn to backend.s3.assume_role.role_arn

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested labels

no-release

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: correcting documentation to nest role_arn under assume_role in the S3 backend configuration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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