Per a question on web a11y slack yesterday, the menuitemradio description first says authors MAY use a separator to divide the menu items (including radios) into groups. The description then goes on to say that authors SHOULD use a group and separators to delimit menuitemradio groups from other menuitems.

It's confusing that the spec is first saying that an author MAY use a separator, only to then be told they SHOULD use a group and also SHOULD use the separator as well when delimiting menu item radio groups.

Part of this contradiction appears to come from the similar description all the menu item roles have... but menuitemradio is also pulling from / trying to stay in sync with content from radiogroup.

I purpose (and will submit a PR for this) that authors MAY use separators to delimit menuitemradio groups, but SHOULD use group. Also, rather than having two sentences that state this MAY allowance for separator, I aim to combine them into a single sentence.