fix key error for huggingface notebook (apache#37435)

Author: ahmedabu98

examples/notebooks/beam-ml/run_inference_huggingface.ipynb

@@ -237,7 +237,7 @@
         "  \"\"\"\n",
         "  def process(self, element):\n",
         "    example = element.example\n",
-        "    translated_text = element.inference[0]['translation_text']\n",
+        "    translated_text = element.inference['translation_text']\n",
         "    print(f'Example: {example}')\n",
         "    print(f'Translated text: {translated_text}')\n",
         "    print('-' * 80)\n"