[fullscreen] An editorial nit in "fullscreen element ready check" (#4)

The third line:

> element's node document's top layer contains no elements whose fullscreen flag is or its top element is an inclusive ancestor of element, which has its fullscreen flag set. 

should probably be

> element's node document's top layer contains no elements whose fullscreen flag is **set** or its top element is an inclusive ancestor of element, which has its fullscreen flag set. 



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https://github.com/whatwg/fullscreen/issues/4