docs: change sparkllm spark_app_url to spark_api_url (#18000)

community: fix - change sparkllm spark_app_url to spark_api_url

- **Description:** 
- Change the variable name from `sparkllm spark_app_url` to
`spark_api_url` in the community package.

---------

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

docs/docs/integrations/chat/sparkllm.ipynb

@@ -99,6 +99,36 @@
     "for chunk in chat.stream(\"Hello!\"):\n",
     "    print(chunk.content, end=\"\")"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "566c85e0",
+   "metadata": {},
+   "source": [
+    "## For v2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "3103ebdf",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "\"\"\"For basic init and call\"\"\"\n",
+    "from langchain_community.chat_models import ChatSparkLLM\n",
+    "from langchain_core.messages import HumanMessage\n",
+    "\n",
+    "chat = ChatSparkLLM(\n",
+    "    spark_app_id=\"<app_id>\",\n",
+    "    spark_api_key=\"<api_key>\",\n",
+    "    spark_api_secret=\"<api_secret>\",\n",
+    "    spark_api_url=\"wss://spark-api.xf-yun.com/v2.1/chat\",\n",
+    "    spark_llm_domain=\"generalv2\",\n",
+    ")\n",
+    "message = HumanMessage(content=\"Hello\")\n",
+    "chat([message])"
+   ]
   }
  ],
  "metadata": {