Plot: This week "Sunday Morning," hosted by Tracy Smith, features Susan Spencer's cover story on dyslexia. Plus: Smith profiles singer-songwriter Taylor Swift; Mo Rocca visits with restaurateur and "Fresh Off the Boat" author Eddie Huang; Barry Petersen saddles up with cowgirl photographer Barbara Van Cleve; Ted Koppel finds out what life on the road is life for tennis professional Noah Rubin, who is not among the top-ranked of his sport; and Conor Knighton discovers what lies behind Argentina's deep Italian roots