Update print responses to be reasoning friendly

[invader89]

This PR updates the code to iterate over the content in the response's message and print the thinking and text types separately.

• The print(response.message.content[0].text) line is replaced with a loop that iterates over each content in response.message.content.
• Inside the loop, there are conditional checks to print the content based on its type (thinking or text).
• The model used in some examples is updated from command-r-08-2024 to command-a-03-2025.

[github-actions]

🌿 Preview your docs: https://cohere-preview-b178fe93-f5e7-482e-b642-568fe5c0e569.docs.buildwithfern.com