AUSTIN—Whether you’re in need of notebooks, rulers, or running shoes, Texas Comptroller Glenn Hegar is reminding shoppers they can save money on those and other items during the state’s sales tax holiday on Friday, Saturday and Sunday, Aug. 9-11. The law exempts sales tax on qualified items—such as clothing, footwear, school supplies, and backpacks—priced below $100, saving shoppers about $8 on…