Feat/mcd ga documentation

[nick-gagliardi]

Description

Updates the Multiple Custom Domains (MCD) documentation from Early Access to General Availability (GA) status. This is a comprehensive update across the MCD doc set covering feature parity, SDK support, new capabilities, and reviewer feedback.

Checklist

• [ x] I've read and followed CONTRIBUTING.md.
• [ x] I've tested the site build for this change locally.
• [ x] I've made appropriate docs updates for any code or config changes.
• [ x] I've coordinated with the Product Docs and/or Docs Management team about non-trivial changes.

[github-actions]

Summary

Status	Count
🔍 Total	111
✅ Successful	32
⏳ Timeouts	0
🔀 Redirected	1
👻 Excluded	77
❓ Unknown	0
🚫 Errors	1
⛔ Unsupported	0

Errors per input

Errors in main/docs/customize/custom-domains/multiple-custom-domains/migration-guide.mdx

• [302] https://support.auth0.com/ | Rejected status code (this depends on your "accept" configuration): Found

Redirects per input

Redirects in main/docs/customize/custom-domains/multiple-custom-domains/migration-guide.mdx

• [200] https://console.cloud.google.com/ | Redirect: Followed 3 redirects resolving to the final status of: OK. Redirects: https://console.cloud.google.com/ --> https://accounts.google.com/ServiceLogin?service=cloudconsole&passive=1209600&osid=1&continue=https://console.cloud.google.com/&followup=https://console.cloud.google.com/ --> https://accounts.google.com/InteractiveLogin?continue=https://console.cloud.google.com/&followup=https://console.cloud.google.com/&osid=1&passive=1209600&service=cloudconsole&dsh=S1396431462:1775606580735386 --> https://accounts.google.com/v3/signin/identifier?continue=https%3A%2F%2Fconsole.cloud.google.com%2F&dsh=S1396431462%3A1775606580735386&followup=https%3A%2F%2Fconsole.cloud.google.com%2F&osid=1&passive=1209600&service=cloudconsole&flowName=WebLiteSignIn&flowEntry=ServiceLogin&ifkv=AT1y2_WyFcmlI1aZePF_f-M5CTCqi31431ixo9kgfIYuTbw6j2I5uOvGsvBwF4wkTuCEOwUV0VrjQA
  Full Github Actions output

Resolved