docs: Update message_history.ipynb (#7677)

Author: yashsharma999

docs/core_docs/docs/how_to/message_history.ipynb

@@ -202,7 +202,7 @@
         "]\n",
         "const output = await app.invoke({ messages: input }, config)\n",
         "// The output contains all messages in the state.\n",
-        "// This will long the last message in the conversation.\n",
+        "// This will log the last message in the conversation.\n",
         "console.log(output.messages[output.messages.length - 1]);"
       ]
     },
@@ -583,4 +583,4 @@
   },
   "nbformat": 4,
   "nbformat_minor": 5
-}
+}