DOC-2021: Point cross-region PrivateLink readers to Terraform support

[Feediver1]

Description

Closes the remaining gap in DOC-2021 (ENG-1063, cross-region AWS PrivateLink via Terraform).

Scope note (2026-07-20): most of this ticket's gap was closed by #635, which merged today with a dedicated Configure cross-region AWS PrivateLink section on the provider page, a pointer from the platform page, and the What's New mention — all stating the correct provider version (v1.7.0+, SME-verified; this PR's original commit message said v1.8.0, which was wrong). This PR's aws-privatelink paragraph was superseded by #635's pointer and has been removed.

What remains in this PR:

• manage/terraform-provider.adoc: the full Dedicated-cluster example's supported_regions comment now notes the multi-AZ requirement (documented in the Requirements lists, but absent at this example site — prevents a confusing failure for single-AZ clusters).

Resolves DOC-2021 (jointly with the substantive docs from #635).

Page previews

• Redpanda Terraform Provider — Dedicated cluster example (updated — the multi-AZ note on the supported_regions comment is verified rendering in this preview)

Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)

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📝 Walkthrough

Walkthrough

The documentation updates clarify cross-region AWS PrivateLink configuration for Terraform-managed clusters. The dedicated cluster example notes that supported_regions is optional, enables cross-region PrivateLink, and requires a multi-AZ cluster. The AWS PrivateLink guide instructs users to set the matching supported_regions value in the Terraform redpanda_cluster resource.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Suggested reviewers: kbatuigas

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title is concise and clearly summarizes the main documentation update for cross-region PrivateLink Terraform support.
Description check	✅ Passed	The description covers the issue, scope, preview, and checklist; it is mostly complete despite omitting the review deadline field.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch DOC-2021-crossregion-privatelink-terraform

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[Feediver1]

PR Review: DOC-2021: multi-AZ note on the Terraform cross-region example (#637)

Files reviewed: 1 .adoc file (+1/−1 after the post-#635 trim)
Overall assessment: Now a clean, single-purpose change; the earlier overlap with #635 is fully resolved.

Review history on this PR

• Original scope overlap (resolved in fb836fd): this PR predated #635's merge; its aws-privatelink paragraph became a redundant second Terraform pointer in the same section (aimed at the generic Dedicated-cluster anchor while #635's intro sentence points at the purpose-built Configure cross-region AWS PrivateLink section). Removed; the PR's net diff is now terraform-provider.adoc only.
• Version correction (recorded): the original commit message's "since v1.8.0" contradicted #635's SME-verified v1.7.0 (tag-checked in schema_resource.go, released 2026-02-26). Corrected in the follow-up commit message, the PR body, and on DOC-2021.

What remains — and it's good

The multi-AZ note on the Dedicated example's supported_regions comment fills a real gap: the requirement is documented in the Requirements lists but was absent at the example a copy-pasting user actually touches — the exact spot where a single-AZ user would hit a confusing failure. Verified rendering in the deploy preview.

Verdict

Ready to merge; resolves DOC-2021 jointly with #635.

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