Updates work items widgets developer docs to use migration helpers

What does this MR do and why?

Contributes to Ensure issue and ticket work item types have th... (#505037 - closed)

Ensure ticket work item type has the same widge... (!174135 - merged) adds migration helpers which makes it easy to define migrations that add widgets to a work item type. This MR adds the new best practice to the work items widgets developer docs with links and code examples.

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• Ensure issue and ticket work item types have th... (#505037 - closed)
• Ensure ticket work item type has the same widge... (!174135 - merged)

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