PBS is launching a six-part miniseries following the cooking of Cecilia Chiang, the mother of Scottsdale-based P.F. Chang's co-founder Philip Chiang. Dubbed "The Kitchen Wisdom of Cecilia Chiang," the series will air nationally on PBS this month, following Cecilia Chiang as she demonstrates her cooking style and Chinese culinary tradition. Cecilia Chiang was one of the first to introduce and popularize northern Chinese cuisine to Americans with her San Francisco restaurant, The Mandarin, in 1961,…