Docs for scatter chart are not correct

[georgeu2000]

The docs for the scatter chart do not seem to be correct:

1. The example does not render a scatter chart. The line is connected.
2. The docs reference a showLines config. This does not seem to do anything.
3. To get the scatter chart to render, I used:

datasets: [{
    label: 'Scatter Dataset',
    showLine: false,
    data: [{
        x: -10,
        ...

I can update the docs, but didn't understand why there is a showLines config and what it is supposed to do.

[etimberg]

@georgeu2000 that looks like the docs are not clear. When specified per dataset, the option is showLine. When specified for the entire chart it is showLines. I will happily merge a PR making updates here. An example of showLines working for the entire chart is https://jsfiddle.net/uLvq3qon/1/

The showLine config turns off the line connecting the points. A scatter chart is built from a line chart, because the action of updating all the points is identical and we wanted to reuse code. We use the option to turn off the line. It should be set to false by default in the default scatter chart config (here https://github.com/chartjs/Chart.js/blob/master/src/charts/Chart.Scatter.js#L5)

[georgeu2000]

OK, I'll see about updating the docs.

There's a scatter type?

The docs use type line for scatter charts. Is there any reason to not use the scatter type?

[etimberg]

the docs should be using type: 'scatter'

[etimberg]

Fixed in #3751