Correct custom chart help text: use newPlot() (#7557)

Author: eradman

viz-lib/src/visualizations/chart/Editor/CustomChartSettings.tsx

@@ -6,7 +6,7 @@ import { EditorPropTypes } from "@/visualizations/prop-types";
 const defaultCustomCode = trimStart(`
 // Available variables are x, ys, element, and Plotly
 // Type console.log(x, ys); for more info about x and ys
-// To plot your graph call Plotly.plot(element, ...)
+// To plot your graph call Plotly.newPlot(element, ...)
 // Plotly examples and docs: https://plot.ly/javascript/
 `);