docs[minor]: Unstructured MD loader doc

docs/core_docs/docs/how_to/document_loader_html.ipynb

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+   "source": [
+    "# How to load HTML\n",
+    "\n",
+    "The HyperText Markup Language or [HTML](https://en.wikipedia.org/wiki/HTML) is the standard markup language for documents designed to be displayed in a web browser.\n",
+    "\n",
+    "This covers how to load `HTML` documents into a LangChain [Document](https://v02.api.js.langchain.com/classes/langchain_core_documents.Document.html) objects that we can use downstream.\n",
+    "\n",
+    "Parsing HTML files often requires specialized tools. Here we demonstrate parsing via [Unstructured](https://unstructured-io.github.io/unstructured/). Head over to the integrations page to find integrations with additional services, such as [FireCrawl](/docs/integrations/document_loaders/web_loaders/firecrawl).\n",
+    "\n",
+    ":::info Prerequisites\n",
+    "\n",
+    "This guide assumes familiarity with the following concepts:\n",
+    "\n",
+    "- [Documents](/docs/concepts#document)\n",
+    "- [Document Loaders](/docs/concepts#document-loaders)\n",
+    "\n",
+    ":::\n",
+    "\n",
+    "## Installation\n",
+    "\n",
+    "```{=mdx}\n",
+    "import Npm2Yarn from \"@theme/Npm2Yarn\"\n",
+    "\n",
+    "<Npm2Yarn>\n",
+    "  @langchain/community\n",
+    "</Npm2Yarn>\n",
+    "```"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "868cfb85",
+   "metadata": {},
+   "source": [
+    "## Setup\n",
+    "\n",
+    "Although Unstructured has an open source offering, you're still required to provide an API key to access the service. To get everything up and running, follow these two steps:\n",
+    "\n",
+    "1. Download & start the Docker container:\n",
+    "  \n",
+    "```bash\n",
+    "docker run -p 8000:8000 -d --rm --name unstructured-api quay.io/unstructured-io/unstructured-api:latest --port 8000 --host 0.0.0.0\n",
+    "```\n",
+    "\n",
+    "2. Get a free API key & API URL [here](https://unstructured.io/api-key), and set it in your environment (as per the Unstructured website, it may take up to an hour to allocate your API key & URL.):\n",
+    "\n",
+    "```bash\n",
+    "export UNSTRUCTURED_API_KEY=\"...\"\n",
+    "# Replace with your `Full URL` from the email\n",
+    "export UNSTRUCTURED_API_URL=\"https://<ORG_NAME>-<SECRET>.api.unstructuredapp.io/general/v0/general\" \n",
+    "```"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "a4d93b2e",
+   "metadata": {},
+   "source": [
+    "## Loading HTML with Unstructured"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "7d167ca3-c7c7-4ef0-b509-080629f0f482",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[\n",
+      "  Document {\n",
+      "    pageContent: 'Word of the Day',\n",
+      "    metadata: {\n",
+      "      category_depth: 0,\n",
+      "      languages: [Array],\n",
+      "      filename: 'wordoftheday.html',\n",
+      "      filetype: 'text/html',\n",
+      "      category: 'Title'\n",
+      "    }\n",
+      "  },\n",
+      "  Document {\n",
+      "    pageContent: ': April 10, 2023',\n",
+      "    metadata: {\n",
+      "      emphasized_text_contents: [Array],\n",
+      "      emphasized_text_tags: [Array],\n",
+      "      languages: [Array],\n",
+      "      parent_id: 'b845e60d85ff7d10abda4e5f9a37eec8',\n",
+      "      filename: 'wordoftheday.html',\n",
+      "      filetype: 'text/html',\n",
+      "      category: 'UncategorizedText'\n",
+      "    }\n",
+      "  },\n",
+      "  Document {\n",
+      "    pageContent: 'foible',\n",
+      "    metadata: {\n",
+      "      category_depth: 1,\n",
+      "      languages: [Array],\n",
+      "      parent_id: 'b845e60d85ff7d10abda4e5f9a37eec8',\n",
+      "      filename: 'wordoftheday.html',\n",
+      "      filetype: 'text/html',\n",
+      "      category: 'Title'\n",
+      "    }\n",
+      "  },\n",
+      "  Document {\n",
+      "    pageContent: 'play',\n",
+      "    metadata: {\n",
+      "      category_depth: 0,\n",
+      "      link_texts: [Array],\n",
+      "      link_urls: [Array],\n",
+      "      link_start_indexes: [Array],\n",
+      "      languages: [Array],\n",
+      "      filename: 'wordoftheday.html',\n",
+      "      filetype: 'text/html',\n",
+      "      category: 'Title'\n",
+      "    }\n",
+      "  },\n",
+      "  Document {\n",
+      "    pageContent: 'noun',\n",
+      "    metadata: {\n",
+      "      category_depth: 0,\n",
+      "      emphasized_text_contents: [Array],\n",
+      "      emphasized_text_tags: [Array],\n",
+      "      languages: [Array],\n",
+      "      filename: 'wordoftheday.html',\n",
+      "      filetype: 'text/html',\n",
+      "      category: 'Title'\n",
+      "    }\n",
+      "  }\n",
+      "]\n"
+     ]
+    }
+   ],
+   "source": [
+    "import { UnstructuredLoader } from \"@langchain/community/document_loaders/fs/unstructured\";\n",
+    "\n",
+    "const filePath = \"../../../../libs/langchain-community/src/tools/fixtures/wordoftheday.html\"\n",
+    "\n",
+    "const loader = new UnstructuredLoader(filePath, {\n",
+    "  apiKey: process.env.UNSTRUCTURED_API_KEY,\n",
+    "  apiUrl: process.env.UNSTRUCTURED_API_URL,\n",
+    "});\n",
+    "\n",
+    "const data = await loader.load()\n",
+    "console.log(data.slice(0, 5));"
+   ]
+  }
+ ],
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+    "mode": "typescript",
+    "name": "javascript",
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