By Philip Pullella VATICAN CITY (Reuters) – The F-word made its debut at a papal general audience on Wednesday but there was no alarm and those who were brandishing it were given VIP treatment. About 30 Italians wearing red T-shirts bearing the words “Fuck Cancer Choir” sat in a front section of Pope Francis’ general audience in St. Peter’s Square, within sight of the pontiff, who was sitting about 40 metres away. Below the phrase on the T-shirts was a clenched first punching through a background of musical notes. The choir, from the northern Italian province of Alessandria, is led by two doct…