Use correct query in chatbot example (elastic#153)

Fixes elastic#147

Author: miguelgrinberg

notebooks/langchain/self-query-retriever-examples/chatbot-example.ipynb

@@ -255,7 +255,7 @@
  "\n",
  "chain = (_context | LLM_CONTEXT_PROMPT | llm)\n",
  "\n",
- "chain.invoke(\"What movies are about dreams and was released after the year 1992 but before 2007?\")"
+ "chain.invoke(\"What movies are about dreams and was released after the year 2007 but before 2012?\")"
  ]
  }
  ],