[whatwg/webidl] Can a required argument be after an optional argument? (Issue #1214)

Long time ago there was this restriction added in 2011:

https://github.com/whatwg/webidl/blob/3785917267f93fa898ee29c3dc1b2239a720565d/Overview.xml#L1391-L1396

This was lifted in 2013 by 97499d48855a9f9012fe145d49b83ccd71d1738b, but I don't think it was well advertised and at least one parser still disallows this: https://github.com/whatwg/webidl/pull/1211#issuecomment-1273170408

I think we need to double check and add an explicit phrase about whether this is allowed or disallowed.

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