add which-motor-is-which to Fritzing diagram

The Fritzing diagram does not currently specify which motor is which. This ought to be easy to fix, as it's already been checked: http://mailtracking.gitter.im/track/click/30050491/gitter.im?p=eyJzIjoiSlVVTWRLVnM3c3diTmh4VHVUSXpEWTFiVGhzIiwidiI6MSwicCI6IntcInVcIjozMDA1MDQ5MSxcInZcIjoxLFwidXJsXCI6XCJodHRwczpcXFwvXFxcL2dpdHRlci5pbVxcXC9PcGVuRmxleHVyZVByb2plY3RcXFwvY29tbXVuaXR5I3V0bV9zb3VyY2U9bm90aWZpY2F0aW9uJnV0bV9tZWRpdW09ZW1haWwmdXRtX2NhbXBhaWduPXVucmVhZC1ub3RpZmljYXRpb25zXCIsXCJpZFwiOlwiOWMyZDc4YzgwNmM0NDkxNjhjMjgyOTZmZDdlMGEzNjNcIixcInVybF9pZHNcIjpbXCI3YjY3ZTA3ZGQ4MzRmZWNiZGNjYjFlNTAxNzc5ZTAzMmVhMDFlYjgzXCJdfSJ9