Fix broken link to full param details for AVD baseline

[SvenAelterman]

Overview/Summary

The auto-generated documentation for the deploy-baseline.bicep file has a double .md extension.

This PR fixes/adds/changes/removes

1. Because I don't know how to fix the auto-generated documentation, I just added another .md to the URL.

As part of this Pull Request I have

• [x] Read the Contribution Guide and ensured this PR is compliant with the guide
• [x] Ensured the resource API versions in .bicep file/s I am adding/editing are using the latest API version possible
• [x] Checked for duplicate Pull Requests
• [x] Associated it with relevant GitHub Issues
• [ ] (AVD LZA Team Only) Associated it with relevant ADO Items
• [x] Ensured my code/branch is up-to-date with the latest changes in the main branch
• [ ] Performed testing and provided evidence.
• [x] Updated relevant and associated documentation (e.g. Contribution Guide, Module READMEs, Docs etc.)

[danycontre]

@SvenAelterman thanks for your contribution.