Update hello_llama_cloud.ipynb (#753)

recipes/quickstart/RAG/hello_llama_cloud.ipynb

@@ -38,6 +38,7 @@
     "!pip install faiss-cpu\n",
     "!pip install bs4\n",
     "!pip install replicate"
+    "!pip install langchain-community"
    ]
   },
   {