[DataTable] example code of DataTable

[jony666666]

Bug report

Steps to reproduce

1. Go to '/material-components-web/packages/mdc-data-table/'
2. Click on 'README.md'
3. Scroll down to 'Variants:Data table with row selection'
4. See error at <svg class="mdc-checkbox__checkmark" viewbox="0 0 24 24">

Actual behavior

the viewbox attribute dosen't work , the style of checkbox is broken .

Your Environment:

Software	Version(s)
MDC Web	-
Browser	Safari 13.04/FireFox 72.0.1
Operating System	macOS 10.15.2

Additional context

Webpack/SASS/Vue

Possible solution

this svg attribute seems to be case-sensitive, i replaced viewbox with viewBox and solved it.

[asyncliz]

Thanks for the issue! Looks like it also needs to be updated in the component test.

Would you be willing to open a PR to fix it?

[asyncliz]

Fixed in #5493