Chicago-based Etta, a sibling concept of high-end surf and turf restaurant Maple & Ash at Scottsdale Waterfront, has opened in the former Brio Tuscan Grille space at Scottsdale Quarter in north Scottsdale. Billed as an ‘‘affordable neighborhood restaurant,’’ Etta (short for Henrietta, which is French for “keeper of the hearth”) specializes in wood-fired pizzas and pastas.