message: Add newtxtext, newtxmath, and stix2 to extra package names
diff: "command": "amssymb",
  "detail": "TeX fonts from the American Mathematical Society",
  "documentation": "https://ctan.org/pkg/amsfonts"
  + },
  + "newtxtext": {
  + "command": "newtxtext",
  + "detail": "Alternative uses of the TX fonts, with improved metrics",
  + "documentation": "https://ctan.org/pkg/newtx"
  + },
  + "newtxmath": {
  + "command": "newtxtmath",
  + "detail": "Alternative uses of the TX fonts, with improved metrics",
  + "documentation": "https://ctan.org/pkg/newtx"
  + },
  + "stix2": {
  + "command": "stix2",
  + "detail": "Type1 versions of the STIX Two OpenType fonts",
  + "documentation": "https://ctan.org/pkg/stix2-type1"
  }
  }
  