Macworld More than four months after unveiling the M3 chip in the new 14-inch MacBook Pro, Apple has finally updated the other laptops in its family, the 13-inch and 15-inch MacBook Air. The new machines are essentially a spec-bump that should make buying a laptop a simpler process. Apple’s three plain-Jane M3 machines range in price from $1,099 to $1,599 and this time around you won’t need to be a computer scientist to figure out which one to buy. Here’s how the pricing breaks down at the simplest level: M3 MacBook Air, 13-inch, 8-core CPU/8-core GPU, 256GB: $1,099M3 MacBook Air, 13-inch, 8-c…