What is the rule that got this PGA Tour winner disqualified at Farmers?

Brennan competed on Torrey Pines’ North Course on Thursday, recording a 2‑under‑par 70 with four birdies and a pair of bogeys. According to the USGA, the rule is as follows: Model Local Rule G-11 Rule 4.3a is modified in this way: During a round, the player may use only the yardage book(s) approved by the Committee. This restriction also applies to any other maps of the course, including hole-location sheets. Additional restrictions apply to handwritten notes...