[Doc] Fix Chart and MarkDef language #3266
Merged
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This will close #2545,
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