I noticed this too. I believe that a new Section 1 (Introduction and Setup) was recently added, but the old Section 1 is still available as section 2. As a result, all the section numbers were bumped up.
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I noticed this too. I believe that a new Section 1 (Introduction and Setup) was recently added, but the old Section 1 is still available as section 2. As a result, all the section numbers were bumped up.