Fix typo in handle_response_model (anthropic system message): responsd -> respond

[timlod]

I was briefly reading the code and this jumped out to me - nothing critical at all but probably worth correcting.

---

:rocket:	This description was created by Ellipsis for commit ddfcded1827dd542bf539c6235695fde8671379b

Summary:

Fixed typo in handle_response_model function in instructor/process_response.py, correcting 'responsd' to 'respond'.

Key points:

• Fixed typo in handle_response_model function in instructor/process_response.py.
• Corrected 'responsd' to 'respond' in system messages.
• Ensures accurate spelling in generated system messages.

---

Generated with :heart: by ellipsis.dev