[heycam/webidl] Where does it say that a nullable record<> cannot be the type of an operation argument? (#297)

This is like https://github.com/heycam/webidl/issues/295 but for operation arguments.  https://heycam.github.io/webidl/#idl-operations says:

> If the Type of an operation argument is an identifier followed by ?, then the identifier must identify an interface, enumeration, callback function or typedef.

Again, nothing about records.

/cc @jyasskin @domenic @tobie 

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