DOCS-829: clarify migration sync and AD certificate discovery coverage

[harrison-akeyless]

Summary

This draft PR applies documentation updates for DOCS-829 to improve coverage for the requested feature set.

Updated in this PR

• Added Automatic Migration Synchronization guidance to Gateway migration docs, including \gateway-sync-migration\ usage.
• Expanded AD migration guidance to clarify AI certificate discovery support for local file system/custom scan locations.
• Updated Automatic Migration CLI reference to include \certificates\ in --ad-discovery-types\ and documented --ai-certificate-discovery\ in both create/update flag sections.
• Updated GitHub USC page with MVG positioning language for GitHub repository secret management.

Validation

Ran file-scoped pre-commit checks on edited files:

• gitleaks: passed
• markdownlint: passed
• cspell: passed
• lychee: passed

Jira

• DOCS-829

Notes

• This PR is intentionally scoped to docs coverage updates and terminology alignment for the requested feature set.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: acb22def-a468-4ec9-a957-b55ea5a65dc8

📥 Commits

Reviewing files that changed from the base of the PR and between cf33c2e and 55160c6.

📒 Files selected for processing (3)

• docs/Akeyless Gateway/configure-gateway/gateway-automatic-migration.md
• docs/Integrations & Plugins/cli-reference/cli-reference-gateway/cli-reference-automatic-migration.md
• docs/Universal Secret Connector/universal-secrets-connector/github-universal-secret-connector.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch v1.0_DOCS-829-feature-update-docs

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[EldadH89]

looks good, please go ahead and merge