Update cmk-migrate-from-byok.md

[paulliew]

removed contacting FT or Acct Manager to start migration

[learn-build-service-prod]

Learn Build status updates of commit 356ad95:

💡 Validation status: suggestions

File	Status	Preview URL	Details
power-platform/admin/cmk-migrate-from-byok.md	💡Suggestion		Details

power-platform/admin/cmk-migrate-from-byok.md

• Line 13, Column 179: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/power-platform/admin/customer-managed-key' will be broken in isolated environments. Replace with a relative link.
• Line 19, Column 22: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/power-platform/admin/customer-managed-key' will be broken in isolated environments. Replace with a relative link.

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[learn-build-service-prod]

Learn Build status updates of commit fc86c79:

✅ Validation status: passed

File	Status	Preview URL	Details
power-platform/admin/cmk-migrate-from-byok.md	✅Succeeded

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