Fix spelling of “whistles” on landing page

[roryokane]

PR Checklist

Please check if your PR fulfills the following requirements:

• Addresses an existing open issue: fixes #000
  • fix is trivial; no issue is needed
• Tests for the changes have been added (for bug fixes / features)
  • Website copy should not be tested

What is the current behavior?

N/A

What is the new behavior?

N/A

Other information

Fixes this mistake on https://start.solidjs.com/:

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Latest commit: b448057

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[atilafassina]

oops. Thanks a lot! :)