By Joseph Currier, Wrestling Observer WWE is billing Brock Lesnar vs. Roman Reigns as “the biggest WrestleMania match in history” and that doesn’t even seem like much of an exaggeration. In what WWE is billing as “the biggest WrestleMania match in history,” Brock Lesnar vs. Roman Reigns will headline Night 2 of WrestleMania 38 on Sunday. As much as it’s hyperbolic to give any match that level of hype, the stakes for Lesnar vs. Reigns are high enough that it doesn’t come off as being too much of an exaggeration. It’s the two biggest stars in WWE right now facing off in a winner-take-all match t…