LiteLLM Example in mistral docs wrong

### Operating System

MacOS

### Version Information

not relevant

### Steps to reproduce

https://github.com/Azure/azureml-examples/blob/main/sdk/python/foundation-models/mistral/litellm.ipynb
@santiagxf Thanks for showing an example with litellm, but the docs are wrong

Here's how to use litellm with mistral
https://docs.litellm.ai/docs/providers/mistral

```python
from litellm import completion
import os

os.environ['MISTRAL_API_KEY'] = ""
response = completion(
model="mistral/mistral-tiny",
api_base="your-api-base",
messages=[
{"role": "user", "content": "hello from litellm"}
],
)
print(response)
```

### Expected behavior

-

### Actual behavior

-

### Addition information

_No response_

Open sdk/python/foundation-models/mistral/litellm.ipynb and compare its LiteLLM usage with the linked LiteLLM Mistral provider documentation. Check the notebook's model, API base, environment variable, and completion example against the issue's reference snippet. Done means the Mistral LiteLLM example matches the documented usage and the notebook remains runnable.

Written by the indexing model from the issue text.