[heycam/webidl] Replace the word "quoted" from IDL grammar section (#976)

https://heycam.github.io/webidl/#idl-grammar


>Thus, the input text “long” is tokenized as the quoted terminal symbol long rather than an identifier called "long", and “.” is tokenized as the quoted terminal symbol . rather than an other.

This is from when terminal symbols were actually quoted with `"`, and now that's not true anymore as they are just monospaced.

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