It mentions it in the giant table. The citation takes you to a page where they mention it in passing

Normal body temperature can vary up to 2°F in a 24 hour period. According to the Guinness Book of World Records (New York: Bantam books, 2000, p. 263), the person with the highest body temperature who lived to tell about it is Willie Jones. On July 10, 1980, Mr. Jones was admitted to the hospital with heatstroke. His temperature was 115.7°F (46.5°C). After 24 days in the hospital, he was discharged. Body temperatures of 109°F can be fatal.  (Statistic from Prevention's Giant Book of Health Facts, 1991.)