Update ollama.mdx

[yousecjoe]

Describe the changes you have made:

Added /v1 to the API base URL in the documentation so OI can find the Ollama model

Reference any relevant issues (e.g. "Fixes #000"):

None

Pre-Submission Checklist (optional but appreciated):

• [ ] I have included relevant documentation updates (stored in /docs)
• [x] I have read docs/CONTRIBUTING.md
• [x] I have read docs/ROADMAP.md

OS Tests (optional but appreciated):

• [ ] Tested on Windows
• [ ] Tested on MacOS
• [x] Tested on Linux