Add the missing menu item in the docs for "Header" (#4552)
Add the missing menu item in the docs for "Header" (#4552)


vega/vega-lite,uwdata/vega-lite,uwdata/vega-lite,vega/vega-lite,vega/vega-lite,vega/vega-lite,uwdata/vega-lite,vega/vega-lite,uwdata/vega-lite,uwdata/vega-lite