[whatwg/fetch] What does "combined value" return for a name not in the header list? (#752)

> A [combined value](https://fetch.spec.whatwg.org/#concept-header-value-combined), given a name (name) and header list (list), is the values of all headers in list whose name is a byte-case-insensitive match for name, separated from each other by 0x2C 0x20, in order.

* The call in https://fetch.spec.whatwg.org/#concept-header-list-sort-and-combine only calls it for names in the header list. That'd match an "Assert: There are some values."
* The call in https://fetch.spec.whatwg.org/#dom-headers-get explicitly returns null for a non-contained name. That'd match having "combined value" return null.
* If we interpret the specification as the Javascript `[values].join(", ")`, we'd get `""` for no-values.

I'd appreciate specifying one of these so I don't accidentally write a use that's ambiguous.

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