Update debugging-main-process-vscode.md (#16363)

[console.log() not printing to terminal when debugging Electron apps. #49](https://github.com/Microsoft/vscode-recipes/issues/49#issuecomment-354367330)

docs/tutorial/debugging-main-process-vscode.md

@@ -22,7 +22,8 @@ $ code electron-quick-start
       "windows": {
         "runtimeExecutable": "${workspaceRoot}/node_modules/.bin/electron.cmd"
       },
-      "args" : ["."]
+      "args" : ["."],
+      "outputCapture": "std"
     }
   ]
 }