Fix errors in "Variables" chapter of the guide.#16345

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EduardoBautista wants to merge 2 commits intorust-lang:masterfrom

EduardoBautista:fix-error-message-in-guide

Commits on Aug 8, 2014

Update error message on compile
Eduardo Bautista
committed
Single curly braces instead of double are being used
Eduardo Bautista
committed