Update description for generic update arguments of az ad commands

[jiasli]

We now support generic update --set on root level (Azure/azure-cli#22798).

Also add a pointer to az rest examples.

[opbld31]

Docs Build status updates of commit a3625cc:

⚠️ Validation status: warnings

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docs-ref-conceptual/microsoft-graph-migration.md

• Line 99, Column 1: [Warning: disallowed-heading - See documentation] Heading 'H2 'Feedback'' matches the text of a disallowed Docs template heading.

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[opbld33]

Docs Build status updates of commit 22abbc5:

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[opbld31]

Docs Build status updates of commit f083a0a:

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[opbld32]

Docs Build status updates of commit 391cb29:

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