Update stop for stop_sequences that is the correct approach

dummy_agent_library.ipynb

@@ -489,7 +489,7 @@
     "output = client.text_generation(\n",
     "    prompt,\n",
     "    max_new_tokens=200,\n",
-    "    stop=[\"Observation:\"] # Let's stop before any actual function is called\n",
+    "    stop_sequences=[\"Observation:\"] # Let's stop before any actual function is called\n",
     ")\n",
     "\n",
     "print(output)"