fix: b001 creativeLlmModel

[panades]

Description

• Problem: The code instantiates creativeLlmModel with temperature=0.9 but calls llmModel.invoke, so the higher temperature is not applied.
• Fix: Replace llmModel.invoke with creativeLlmModel.invoke for the poem request.
• Impact: Aligns the example with the intended behavior (creative output). No API changes or side effects.

Changes

• creativeLlmModel = OpenAI(temperature=0.9)
• response = creativeLlmModel.invoke("Write a short 5 line poem about JFK")

Testing

• Manually verified the response becomes more diverse/creative with temperature=0.9.
• No breaking changes; existing examples continue to work.