Fix container typo

Author: saurabh3949

introduction_to_amazon_algorithms/seq2seq_translation_en-de/SageMaker-Seq2Seq-Translation-English-German.ipynb

@@ -390,7 +390,7 @@
     "print(model_data)\n",
     "\n",
     "primary_container = {\n",
-    "    'Image': docker_image,\n",
+    "    'Image': container,\n",
     "    'ModelDataUrl': model_data\n",
     "}\n",
     "\n",