[Doc] Fix Chart and MarkDef language #3266
Merged
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This will close #2545,
![image](https://private-user-images.githubusercontent.com/75072960/283377874-ceb5eaf9-1961-4234-a528-b96cfffb97c4.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MjEzMTI0MzgsIm5iZiI6MTcyMTMxMjEzOCwicGF0aCI6Ii83NTA3Mjk2MC8yODMzNzc4NzQtY2ViNWVhZjktMTk2MS00MjM0LWE1MjgtYjk2Y2ZmZmI5N2M0LnBuZz9YLUFtei1BbGdvcml0aG09QVdTNC1ITUFDLVNIQTI1NiZYLUFtei1DcmVkZW50aWFsPUFLSUFWQ09EWUxTQTUzUFFLNFpBJTJGMjAyNDA3MTglMkZ1cy1lYXN0LTElMkZzMyUyRmF3czRfcmVxdWVzdCZYLUFtei1EYXRlPTIwMjQwNzE4VDE0MTUzOFomWC1BbXotRXhwaXJlcz0zMDAmWC1BbXotU2lnbmF0dXJlPWM1NDZhZmZmYjQ2MjQ4NmMzZDZlOGFhMGE4ZGQwNTUzNThlZjFkYTNkYWNhZTg0NmY2NmI0YmNiZWNjMTUzMDQmWC1BbXotU2lnbmVkSGVhZGVycz1ob3N0JmFjdG9yX2lkPTAma2V5X2lkPTAmcmVwb19pZD0wIn0.MKFroxyRITpLNQxcUiCEq6V9g1QoI4Sqnmy32E7FVxI)
where the usage should be alt.Chart(df, mark=alt.CompositeMarkDef(type='boxplot'))
this PR update definition in https://altair-viz.github.io/user_guide/generated/toplevel/altair.Chart.html,
but for MarkDef in https://altair-viz.github.io/user_guide/generated/core/altair.MarkDef.html
Seems like it's generated from vega-lite-schema and I might need some instruction on where to start