patch langcahin docs example

Author: miararoy

generation/langchain/handbook/05-langchain-retrieval-augmentation.ipynb

@@ -36,7 +36,6 @@
       "source": [
         "!pip install -qU \\\n",
         "    datasets==2.12.0 \\\n",
-        "    apache_beam \\\n",
         "    mwparserfromhell"
       ]
     },
@@ -76,7 +75,7 @@
       "source": [
         "from datasets import load_dataset\n",
         "\n",
-        "data = load_dataset(\"wikipedia\", \"20220301.simple\", split='train[:10000]')\n",
+        "data = load_dataset(\"wikipedia\", \"20220301.simple\", split='train')[:10000]\n",
         "data"
       ]
     },