Beachgoers on Galveston's east-end Seawall are being encouraged to stop feeding raccoons after a rise in raccoon bites has sparked concerns about possible rabies exposure. According to city officials, repeated feeding is helping create the problem by training the animals to seek out food from people. Here's what to know A city animal services supervisor counted 21 raccoons along that stretch of the Seawall, many gathered near signs telling visit…