OCI - Update custom domains guide

[thomascavanagh-okta]

Description:

• What's changed? Part of the OCI docs. Review the custom domains guide and verify all the information and steps.
• Is this PR related to a Monolith release? Yes, 2025.11.0

Resolves:

• OKTA-1013175

[okta-prod-github-app]

Acrolinx Scorecards

Acrolinx checked the content changed here.

Please review the scorecards for each file and make the recommended
improvements.

Article	Score	Issues	Scorecard	Status
packages/@okta/vuepress-site/docs/concepts/brands/index.md	84	35	→	✅
packages/@okta/vuepress-site/docs/guides/custom-url-domain/main/index.md	81	128	→	✅

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Depending on the Acrolinx server configuration, the
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[okta-prod-github-app]

Acrolinx Scorecards

Acrolinx checked the content changed here.

Please review the scorecards for each file and make the recommended
improvements.

Article	Score	Issues	Scorecard	Status
packages/@okta/vuepress-site/docs/concepts/brands/index.md	84	35	→	✅
packages/@okta/vuepress-site/docs/guides/custom-url-domain/main/index.md	81	124	→	✅

Successfully checked 2 of 2 documents.
See summary in Content Analysis Dashboard

Reopen the pull request or push new changes to check again.

Depending on the Acrolinx server configuration, the
links expire after some time and you must have a login for the
Acrolinx server to access them again.

[okta-prod-github-app]

Acrolinx Scorecards

Acrolinx checked the content changed here.

Please review the scorecards for each file and make the recommended
improvements.

Article	Score	Issues	Scorecard	Status
packages/@okta/vuepress-site/docs/concepts/brands/index.md	84	35	→	✅
packages/@okta/vuepress-site/docs/guides/custom-url-domain/main/index.md	81	128	→	✅

Successfully checked 2 of 2 documents.
See summary in Content Analysis Dashboard

Reopen the pull request or push new changes to check again.

Depending on the Acrolinx server configuration, the
links expire after some time and you must have a login for the
Acrolinx server to access them again.

[eng-info-dev-github-bot]

Netlify Preview URL for the changes: https://preview-5760--reverent-murdock-829d24.netlify.app

[okta-prod-github-app]

Acrolinx Scorecards

Acrolinx checked the content changed here.

Please review the scorecards for each file and make the recommended
improvements.

Article	Score	Issues	Scorecard	Status
packages/@okta/vuepress-site/docs/concepts/brands/index.md	84	35	→	✅
packages/@okta/vuepress-site/docs/guides/custom-url-domain/main/index.md	81	129	→	✅

Successfully checked 2 of 2 documents.
See summary in Content Analysis Dashboard

Reopen the pull request or push new changes to check again.

Depending on the Acrolinx server configuration, the
links expire after some time and you must have a login for the
Acrolinx server to access them again.