Broadway is back! Well, it’s coming back in September.I know, as a parody to the old song would go: “Oh, it’s a long, long time from June to September…”But, in the meantime, for those of you who may want to get excited about the reopening of the Great White Way, you need look no further than this past week’s version of “The Tonight Show Starring Jimmy Fallon.” It’s available to watch on YouTube.There you will find Fallon and special guest Lin-Manuel Miranda give, in a …