Update work item by ID (basic fields)
Updates a single work item by ID, changing only the columns you set in the SET clause. Use WHERE Id = ... to target the item. You can update title, description, custom fields, state, and other writable fields. For read-only fields (e.g. ResolvedBy) you must set BypassRules in WITH; see the "Update readonly fields" example.
UPDATE WorkItems SET
Title = 'Renamed Work Item Title',
CustomMyField = 'New Custom Text'
WHERE Id = 7455