Swap factorization machines MNIST data source (aws#2574)

Author: jkroll-aws

introduction_to_amazon_algorithms/factorization_machines_mnist/factorization_machines_mnist.ipynb

@@ -74,8 +74,8 @@
     "region = boto3.Session().region_name\n",
     "\n",
     "# S3 bucket where the original mnist data is downloaded and stored.\n",
-    "downloaded_data_bucket = f\"jumpstart-cache-prod-{region}\"\n",
-    "downloaded_data_prefix = \"1p-notebooks-datasets/mnist\"\n",
+    "downloaded_data_bucket = f\"sagemaker-sample-files\"\n",
+    "downloaded_data_prefix = \"datasets/image/MNIST\"\n",
     "\n",
     "print(role)\n",
     "sess = sagemaker.Session()\n",