By Jarrett Renshaw, Gabriella Borter and Brad Brooks UVALDE, Texas (Reuters) -President Joe Biden tried to comfort families in the south Texas town of Uvalde on Sunday after the nation’s deadliest school shooting in a decade as federal officials announced they would review local law enforcement’s slow response to the attack. Anger has mounted over the decision by law enforcement agencies in Uvalde to allow the shooter to remain in a classroom for nearly an hour while officers waited in the hallway and children inside the room made panicked 911 calls for help. The president and first lady Jill …