Check: Add Group Name parameter

[adamhathcock]

Checkboxes do behave as a group if named the same so add that like Radios

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[adamhathcock]

I have read the CLA Document and I hereby sign the CLA

[stsrki]

I wasn't aware that name is valid on the checkbox, only on the radio. But according to MDN(https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/checkbox#handling_multiple_checkboxes) it seems to be valid HTML.

I think it would be best to rename the parameter as Name, instead of Group. It is more per HTML specs. Agree?

Also it would be great if you could add an example in the docs.

[adamhathcock]

Sure about Name. I was just following what radio did

I'll add docs too

[adamhathcock]

Thanks, I wasn't aware all that was needed!

[stsrki]

LGTM. Thank you for the contribution.