39063 - Updates to docs to use proper timestamp, ordering, keys

[RachelElysia]

Issue

Doc revision for #39063

Description

Fixes discrepancies between returned data and current 4.84 docs

• Remove mdm_migration_deadline from dep_device and only keep on host_dep_assignment (it’s part of the migration assignment, not the DEP device).
• Include dep_device.op_date DEP/ADE device metadata as seen on returned data
• Normalize all timestamps to RFC3339 with Z (e.g., 2025-12-04T01:35:27Z instead of 2025-12-04 01:35:27) as seen on returned data

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