Re: [fetch] OpenEndedDictionary clarification (#164)

We're just doing a large commit of the Fetch API to scala.js, which involves trying to take into account all or as many as possible of the types that are in defined in the spec. @mseddon has more experience with this so he is helping review my code. This is how we came across this. Here is the PR https://github.com/scala-js/scala-js-dom/pull/177/files

Currently I have OpenEndedDictionary defined as 

```scala
 /**
+   * see [[https://fetch.spec.whatwg.org/#headers-class ¶6.1 Headers class]] in
+   * whatwg Fetch spec.
+   * also see: [[https://github.com/whatwg/fetch/issues/164 issue 164]] in Fetch
+   * API git repo, as this is not clearly defined
+   */
+  type OpenEndedDictionary[T] = js.Dictionary[T]
```


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