docs[minor]: Add missing link to Runnables guide (langchain-ai#6566)

Co-authored-by: Bagatur <baskaryan@gmail.com>
Co-authored-by: Brace Sproul <braceasproul@gmail.com>

docs/core_docs/docs/how_to/sequence.ipynb

@@ -63,6 +63,21 @@
     "```"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "// @lc-docs-hide-cell\n",
+    "import { ChatOpenAI } from '@langchain/openai';\n",
+    "\n",
+    "const model = new ChatOpenAI({\n",
+    "  model: \"gpt-4o\",\n",
+    "  temperature: 0,\n",
+    "})"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 2,
@@ -72,7 +87,6 @@
     "import { StringOutputParser } from \"@langchain/core/output_parsers\";\n",
     "import { ChatPromptTemplate } from \"@langchain/core/prompts\";\n",
     "\n",
-    "\n",
     "const prompt = ChatPromptTemplate.fromTemplate(\"tell me a joke about {topic}\")\n",
     "\n",
     "const chain = prompt.pipe(model).pipe(new StringOutputParser())"
@@ -142,7 +156,7 @@
     "const analysisPrompt = ChatPromptTemplate.fromTemplate(\"is this a funny joke? {joke}\")\n",
     "\n",
     "const composedChain = new RunnableLambda({\n",
-    "  func: async (input) => {\n",
+    "  func: async (input: { topic: string }) => {\n",
     "    const result = await chain.invoke(input);\n",
     "    return { joke: result };\n",
     "  }\n",
@@ -210,15 +224,15 @@
     "\n",
     "You now know some ways to chain two runnables together.\n",
     "\n",
-    "To learn more, see the other how-to guides on runnables in this section."
+    "To learn more, see the other how-to guides on runnables in [this section](/docs/how_to/#langchain-expression-language-lcel)."
    ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Deno",
+   "display_name": "TypeScript",
    "language": "typescript",
-   "name": "deno"
+   "name": "tslab"
   },
   "language_info": {
    "codemirror_mode": {