tweak bollinger example

mbostock · mbostock · commit 7e458ff9dda4 · 2023-08-06T10:25:58.000-07:00
diff --git a/docs/marks/bollinger.md b/docs/marks/bollinger.md
@@ -47,7 +47,7 @@ Plot.plot({
   marks: [
     Plot.lineY(aapl, Plot.mapY(Plot.bollinger({n: 20, k: -2}), {x: "Date", y: "Close", stroke: "red"})),
     Plot.lineY(aapl, Plot.mapY(Plot.bollinger({n: 20, k: 2}), {x: "Date", y: "Close", stroke: "green"})),
-    Plot.lineY(aapl, Plot.mapY(Plot.bollinger({n: 20}), {x: "Date", y: "Close"}))
+    Plot.lineY(aapl, {x: "Date", y: "Close"})
   ]
 })
 ```

Original file line number	Diff line number	Diff line change
`@@ -47,7 +47,7 @@ Plot.plot({`
`47`	`47`	`marks: [`
`48`	`48`	`Plot.lineY(aapl, Plot.mapY(Plot.bollinger({n: 20, k: -2}), {x: "Date", y: "Close", stroke: "red"})),`
`49`	`49`	`Plot.lineY(aapl, Plot.mapY(Plot.bollinger({n: 20, k: 2}), {x: "Date", y: "Close", stroke: "green"})),`
`50`		`- Plot.lineY(aapl, Plot.mapY(Plot.bollinger({n: 20}), {x: "Date", y: "Close"}))`
	`50`	`+ Plot.lineY(aapl, {x: "Date", y: "Close"})`
`51`	`51`	`]`
`52`	`52`	`})`
`53`	`53`	```