fix small typo in the webfont alternatives page

[jota11]

commit message says it all

Proposed Changes

Types of Changes

What types of changes does your code introduce?

• Documentation Update
• Bugfix (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)

Checklist

• I have read the Contributing doc.
• Lint passes locally with my changes.
• I have added necessary documentation (if appropriate).

Additional Information