docs[patch]: extraction_examples fix the examples given to the llm (#23393)
Descriptions: currently in the
[doc](https://python.langchain.com/v0.2/docs/how_to/extraction_examples/)
it sets "Data" as the LLM's structured output schema, however its
examples given to the LLM output's "Person", which causes the LLM to be
confused and might occasionally return "Person" as the function to call
issue: #23383
Co-authored-by: Lifu Wu <lifu@nextbillion.ai>