docs: Fix typo in Tavily Search example (#28034)

Changed "demon" to "demo" in the code comment for clarity.

PR Title
docs: Fix typo in Tavily Search example

PR Message
Description:
This PR fixes a typo in the code comment of the Tavily Search
documentation. Changed "demon" to "demo" for clarity and to avoid
confusion.

Issue:
No specific issue was mentioned, but this is a minor improvement in
documentation.

Dependencies:
No additional dependencies required.

docs/docs/integrations/tools/tavily_search.ipynb

@@ -186,7 +186,7 @@
     }
    ],
    "source": [
-    "# This is usually generated by a model, but we'll create a tool call directly for demon purposes.\n",
+    "# This is usually generated by a model, but we'll create a tool call directly for demo purposes.\n",
     "model_generated_tool_call = {\n",
     "    \"args\": {\"query\": \"euro 2024 host nation\"},\n",
     "    \"id\": \"1\",\n",