docs: add mistralai/codestral-2508 (#323)

Author: Lookoff-AIMLAPI

docs/SUMMARY.md

@@ -177,6 +177,7 @@
   * [Mistral AI](api-references/text-models-llm/Mistral-AI/README.md)
     * [Mistral Nemo](api-references/text-models-llm/Mistral-AI/mistral-nemo.md)
     * [Leanstral 1.5](api-references/text-models-llm/Mistral-AI/labs-leanstral-1-5.md)
+    * [Codestral 2508](api-references/text-models-llm/Mistral-AI/codestral-2508.md)
   * [Moonshot](api-references/text-models-llm/moonshot/README.md)
     * [kimi-k2-preview](api-references/text-models-llm/moonshot/kimi-k2-preview.md)
     * [Kimi k2.5](api-references/text-models-llm/moonshot/kimi-k2-5.md)