docs: small cleanup (#733)

examples/tutorials/sql-agent.ipynb

@@ -165,7 +165,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr --no-display\n",
-    "!pip install langchain_community langchain_openai"
+    "!pip install langgraph langchain_community langchain_openai"
    ]
   },
   {
@@ -246,6 +246,7 @@
     "\n",
     "from langchain_core.messages import ToolMessage\n",
     "from langchain_core.runnables import RunnableLambda, RunnableWithFallbacks\n",
+    "from langgraph.prebuilt import ToolNode\n",
     "\n",
     "\n",
     "def create_tool_node_with_fallback(tools: list) -> RunnableWithFallbacks[Any, dict]:\n",
@@ -380,7 +381,7 @@
     }
    ],
    "source": [
-    "from langchain.agents import tool\n",
+    "from langchain_core.tools import tool\n",
     "\n",
     "\n",
     "@tool\n",
@@ -501,7 +502,6 @@
     "\n",
     "from langgraph.graph import END, StateGraph\n",
     "from langgraph.graph.message import AnyMessage, add_messages\n",
-    "from langgraph.prebuilt.tool_node import ToolNode\n",
     "\n",
     "\n",
     "# Define the state for the agent\n",