Update calculator example description

[look]

The example in the README uses "sum" for both sum and sub. I changed it to "difference". For consistency, I also updated the example code to use the same term.

Motivation and Context

I noticed the README was incorrect.

How Has This Been Tested?

No, example code only.

Breaking Changes

No

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

N/A

[jokemanfire]

thanks

[jokemanfire]

just fix the lint

[rikhuijzer]

@look to maybe save you some time, I think this should fix the lint error:

$ git reset --soft HEAD~1

$ git add .

$ git commit -m "docs: update calculator example description"

$ git push --force

[look]

Thanks for merging. Sorry I didn't see the lint warning because CI didn't run for me. I will make sure I lint locally next time.