[Docs] Update Windows openface installation guide

[Lixxx1]

📝 Description

🔧 Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Performance improvement
• Other (please describe):

🧪 Testing

• Action Unit (AU) Pipeline verified
• Audio Analysis Pipeline tested
• Video Analysis Pipeline confirmed
• Image Analysis Pipeline validated
• Full MER Pipeline end-to-end tested
• No pipeline verification required

📋 Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

🔗 Related Issues

📸 Screenshots (if applicable)

💬 Additional Notes