docs: fix typo in example/package.json

Author: wirekang

example/package.json

@@ -19,7 +19,7 @@
     "@adminjs/express": "^5.0.0",
     "@faker-js/faker": "^7.5.0",
     "adminjs": "^6.2.0",
-    "adminjs-sql": "file:../",
+    "adminjs-sql": "file:..",
     "express": "^4.18.1",
     "express-formidable": "^1.2.0",
     "express-session": "^1.17.3",