Minor typo fix (langchain-ai#11804)

remove redundant a
langchain > LangChain

docs/docs/integrations/chat_loaders/langsmith_dataset.ipynb

@@ -52,9 +52,9 @@
    "id": "8533ab63-d437-492a-aaec-ccca31167bf2",
    "metadata": {},
    "source": [
-    "## 1. Select dataset\n",
+    "## 1. Select a dataset\n",
     "\n",
-    "This notebook fine-tunes a model directly on a selecting which runs to fine-tune on. You will often curate these from traced runs. You can learn more about LangSmith datasets in the docs [docs](https://docs.smith.langchain.com/evaluation/datasets).\n",
+    "This notebook fine-tunes a model directly on selecting which runs to fine-tune on. You will often curate these from traced runs. You can learn more about LangSmith datasets in the docs [docs](https://docs.smith.langchain.com/evaluation/datasets).\n",
     "\n",
     "For the sake of this tutorial, we will upload an existing dataset here that you can use."
    ]