Update migration activities support in migration-api-overview.md

[paya54]

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Learn Build status updates of commit 601a8ed:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/apis/migration-api-overview.md	✅Succeeded	View

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[andrewconnell]

@paya54 Please complete the instructions in the PR description as required for new PRs. Once this is done, we'll review the PR submission.