Clarification of let variables declarations #3453
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Change made to make it clear that let variables cannot be declared in the global scope. This small addition makes it more explicitly clear. It's one of the questions asked in the follow along quiz version of the book and while following along it wasn't made clear until a question was asked. I think having it explicitly stated in the book will be helpful.
improved the wording
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Re-worded part of the explaining the differences between const and let variables to make it explicitly clear that let variables cannot be declared in the global scope.