Update supported models with Mistral 3

[ravi03071991]

Motivation

PR to update docs to support latest Mistral Small 3 release.

Modifications

Updated supported_models.md file with Mistral Small 3.

Checklist

• Format your code according to the Code Formatting with Pre-Commit.
• Add unit tests as outlined in the Running Unit Tests.
• Update documentation / docstrings / example tutorials as needed, according to Writing Documentation.
• Provide throughput / latency benchmark results and accuracy evaluation results as needed, according to Benchmark and Profiling.