By Shreyashi Sanyal (Reuters) -European shares edged up on Thursday, lifted by Spanish lenders on a report that Madrid could modify a bank tax, while markets also showed some signs of recovery from a sharp selloff triggered by bets of aggressive interest rate hikes globally. The STOXX 600 index was up 0.4%, as of 0808 GMT, after slumping for two consecutive days, with European banks advancing nearly 2%. Euro zone banks jumped 2.5% to hit their highest levels since June 10. Spanish banking stocks including Bankinter, Sabadell and Caixabank, rose nearly 5% each after a local media report stated …