docs: Add shadow_link to Terraform provider resource list (DOC-2022)

[Feediver1]

Resolves https://redpandadata.atlassian.net/browse/DOC-2022

Adds shadow_link to the resource list on the Redpanda Terraform provider page, linking to the registry reference. The resource shipped in provider v2.0.0.

Companion docs PR adds Terraform tabs to the single-sourced Configure Shadowing page (create and update sections); that content flows to the cloud-docs stub automatically.

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Preview pages

• Redpanda Terraform provider (updated: Shadow links added to the resource list)
• What's New in Redpanda Cloud (updated: Terraform provider Shadow link management entry, July 2026 — added for DOC-2395)

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📝 Walkthrough

Walkthrough

The Terraform provider resource list in the manage documentation now includes Shadow links.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: david-yu

🚥 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 clearly matches the change: adding shadow_link to the Terraform provider resource list.
Description check	✅ Passed	The description covers the issue, summary, and previews, but it omits the review deadline and checks section from the template.

✨ Finishing Touches

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• Commit unit tests in branch DOC-2022-terraform-shadow-link

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[Feediver1]

Docs team standards review (automated final pass)

Files reviewed: 2 .adoc files (+5 lines)
Overall assessment: Clean and fully verified — every product claim traces to the provider's shipped schema and docs. No critical issues, no content suggestions.

Verification detail

• shadow_link shipped in v2.0.0 ✓ — provider release v2.0.0 (2026-06-03) includes "Feat/shadow link" (terraform-provider-redpanda#343). The "(v2.0.0+)" claim is exact.
• Registry link returns 200 ✓; resource list stays alphabetical ✓.
• Every sync-options claim matches the shipped schema ✓ — client_options, topic_metadata_sync_options, consumer_offset_sync_options, security_sync_options (ACLs), and schema_registry_sync_options all exist on the resource.
• The password-as-secret claim is precisely right ✓ — the provider requires SASL credentials as ${secrets.<NAME>} references to dataplane secrets on the shadow cluster ("the plaintext value never leaves the shadow cluster's secret store"), so Terraform state holds only the reference.
• June placement is correct by convention ✓ — entries group by ship month; the sibling v2.0.0 secrets entry is in June.
• Companion docs#1827 is merged, so the entry's setup.adoc xref lands on content that includes the Terraform tabs.

Jira

• DOC-2022: this PR is the cloud-docs remainder; note the ticket is already Done, so merging promptly keeps the board honest.
• DOC-2395 (What's New umbrella, In Review): this contributes the Terraform shadow-link entry.

Optional thought (non-blocking)

This is the first Cloud What's New mention of Shadowing at all — if Shadowing-on-Cloud warrants its own announcement entry, this one would read better landing after it. Product/marketing call.

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