[selection-api] Is Selection.removeAllRanges() and Selection.removeRange(range) doing same thing? (#48)

* **As Selection.removeAllRanges() and Selection.removeRange(range) uses the same statement**   
      `The method must make the context object empty by disassociating its range if the context object's range is` *range*.` Otherwise, it must do nothing.`

One more point, what is *range*, in Selection.removeAllRanges() when we are saying `if the context object's range is` *range*`.

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https://github.com/w3c/selection-api/issues/48