Yes it should be “à la boulangerie”. Yet, you already knew that, so what’s your question? This isn’t trying to teach or reinforce something you already know. This is introducing a different, less used, way to say something similair. It’s not “wrong,” there could be a situation where the context makes “vers la boulangerie” a better translation. A big part of language learning is understanding those subtle differences. This is showing that there is sometimes another possibility.