genai updates

Author: s-sajid-ali

docs/genai/02_external_llms/02_catalogue.md

@@ -12,5 +12,6 @@ We currently facilitate access to the following externally hosted LLMs:
 -   gemini-2.5 models (pro, flash)
 -   gemini-2.5-flash-lite-preview-06-17
 -   gemini-2.0 models (flash, flash-lite)
+-   gemini-embedding-001
 
 For a comprehensive list, please [refer to the VertexAI documentation](https://cloud.google.com/vertex-ai/generative-ai/docs/learn/models).