chore: fix broken TODO comment with accidental URL

[Zentex1337]

Summary

• Clean up a TODO comment in ThemeConstantsUtil.ts that had a localhost URL accidentally pasted into it
• The original comment @TODO: Provide proper values to something sm, md, lg, http://localhost:6006/?path=/docs/theme-spacing--docsxl, etc. is now cleaned to @TODO: Provide proper values using named sizes (sm, md, lg, xl, etc.)

Test plan

• Comment-only change, no functional impact
• Improves code readability

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