Add enable DR doc for HVD

[jonathanfrappier]

Description

🎫 SPE-1322

• Add doc to enable DR replication for new and existing clusters
• Describes DR management by HashiCorp and directs customers to contact support to test failover

Requested review scope:

• Content touched by the PR only (typos, clarifications, tips)
• Code test (command and code block changes)
• Flow and language near changes (new/rearranged steps)
• Review everything (rewrites, major changes)

Review urgency:

• ASAP (bug fixes, broken content, imminent releases)
• 3 days (small changes, easy reviews)
• 1 week (default)
• Best effort (very non-urgent)

All updates:

I have:

• Verified that all status checks have passed
• Verified that preview environment has successfully deployed
• Verified appropriate label applied (hcp + product name)
• Added all required reviewers (code owners and external)

Content checklist (optional)

Please do these things before requesting a review. I have:

• Made any associated code repositories public
• Added the hashicorp-education/teamName to any additional code or example repos as repo admin
• Added redirects for any moved or removed pages
• Spell checked the tutorial(s)
• Followed the unified style guide
• Linted code snippets (Details per language here)
• Checked the steps for completeness (no steps are implied or hidden)
• Looked at the local or vercel build and checked each new or changed page for:
  • display on the product curriculum page
  • callout box formatting
  • code block highlighting
  • right-hand navigation
  • next and back buttons
  • URL path

[github-actions]

Vercel Previews Deployed

Name	Status	Preview	Updated (UTC)
Dev Portal	✅ Ready (Inspect)	Visit Preview	Fri Nov 14 17:58:55 UTC 2025
Unified Docs API	✅ Ready (Inspect)	Visit Preview	Fri Nov 14 17:52:51 UTC 2025

[yhyakuna]

Looks good 👍

[github-actions]

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