Inaccurate warning for VertexAI Gemini Function Calling

[ddobrin]

Documentation:
https://docs.spring.io/spring-ai/reference/api/chat/functions/vertexai-gemini-chat-functions.html

states incorrectly that:
WARNING: Apparently the Gemini Pro can not handle anymore the function name correctly. The parallel function calling is gone as well.

The statement needs to be removed from the docs

[jebseibel]

This looks like a good first time contribution for me. I'll fix.

[jebseibel]

I have signed the contributor license agreement. I guess I need to be given auth to push a branch to the repo?
fatal: unable to access 'https://github.com/spring-projects/spring-ai.git/': The requested URL returned error: 403