[whatwg/dom] New "event constructing steps" could use an example (#683)

The new "event constructing steps" could use an example, because they are quite circular and somewhat hard to follow. 

The problem is that you can have a normal user-land constructor (e.g., developer creates an untrusted event named "e" for whatever reason) and the UA itself runs the "event constructing steps", which are internal (but set the event to some specific name).

Another thing that should be clarified is where does "constructor" play a role in the "event constructing steps" (if any).   


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