[DataGrid] Fix custom column docs, remove legacy extendType
#10175
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As I understand it, this property has no effect since #7309. I have noticed the issue looking at a date formatting issue with Toolpad: https://github.com/mui/mui-toolpad/blob/32d14b33cd296b204a1ce9b3199035524bd751db/packages/toolpad-components/src/DataGrid.tsx#L285
But the docs look wrong too: https://mui.com/x/react-data-grid/filtering/customization/#custom-column-types.