Update hello_llama_cloud.ipynb

Fix: LangChai->LangChain

recipes/quickstart/RAG/hello_llama_cloud.ipynb

@@ -23,7 +23,7 @@
     "Let's start by installing the necessary packages:\n",
     "- sentence-transformers for text embeddings\n",
     "- FAISS gives us database capabilities \n",
-    "- LangChai provides necessary RAG tools for this demo"
+    "- LangChain provides necessary RAG tools for this demo"
    ]
   },
   {