Housekeeper: Add documentation on change’s properties

What does this MR do and why?

This MR improves the documentation on the topic of a change object. A change object can have various properties set on it, some of these are mandatory, but it has not been called out explicitly in the documentation till now.

This can serve as a good improvement to increase adoption of housekeeper.

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changed milestone to %16.11

added backend docs-only labels

assigned to @manojmj

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• 5c31253b - Add documentation on change’s properties

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@manojmj - please see the following guidance and update this merge request.

	1 Error
	Please add typebug typefeature, or typemaintenance label to this merge request.

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• a75ed45c - Add documentation on change’s properties

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@DylanGriffith could you please review?

requested review from @DylanGriffith