fix: change function from cross_table to join

Author: tak-ka3

notebooks/tutorial/basic_apc_cli_tutorial.ipynb

@@ -424,7 +424,7 @@
    "source": [
     "import os\n",
     "\n",
-    "%env FUNCTION_SOURCE_PATH=../../functions/cross_table\n",
+    "%env FUNCTION_SOURCE_PATH=../../functions/join\n",
     "\n",
     "FUNCTION_SOURCE_PATH = os.environ.get(\"FUNCTION_SOURCE_PATH\")\n",
     "\n",