Voters will decide on two Bexar County propositions in the Nov. 4 election, both related to the Spurs’ potential relocation to a new arena in downtown San Antonio. The price tag for that arena, which would be located at Hemisfair, is estimated at $1.3 billion.>>BALLOT: Nov. 4 election on funding for downtown Spurs arena and upgrades to Coliseum grounds, 17 Texas amendmentsHere’s how the proposed funding structure for the new Spurs arena will wor…