fix minor typo in readme

[Nyholm]

This is pure documentation

Motivation and Context

We want to look professional

How Has This Been Tested?

Proof reading

Breaking Changes

Nope

Types of changes

• 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 change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

[chr-hertel]

Thank you @Nyholm 🙌