By Bret Kenwell AT&T; stock is higher after the merger with Discovery. Here’s how the charts look now. Shares of AT&T (T) – Get AT&T Inc. Report are higher on Monday, at last check about 8% up, after the company completed its merger with Discovery on Friday. The split leaves the pure-play AT&T business under AT&T (and the T ticker symbol, while its WarnerMedia business (including HBO) merged into Discovery — hence the WBD ticker symbol. (Adjusted for the transfer of media assets to Warner Bros. Discovery, legacy AT&T is trading lower from Friday.) One could make an argument that AT&T is now un…