docs: add order state example

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• cc7f4d1d - fix markdown

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• 85be16e6 - example order-state: renamed preparing -> processing

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• 85be16e6...69816bb0 - 45 commits from branch master
• 51aaa246 - docs: add order state example
• 4ffbcd20 - fix markdown
• 0c4bb6dd - example order-state: renamed preparing -> processing
• b08a34f6 - fixed after rebase
• f07cd7e6 - strictness: enum checks if all values called parent constructor

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• 71079e17 - fixed after rebase
• 16fc102f - strictness: enum checks if all values called parent constructor

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• 9de18e66 - allowed to call self::VALUE2() on child classes

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enabled an automatic merge when the pipeline for 9de18e66 succeeds

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