[Docs site] update wrong text in c3 prompt

[jsparkdev]

Summary

• Updates Hello World Starter to Hello World example.
• I did this because the workers-sdk project has a history of updating Starter to example.

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Updated terminology in the documentation to reflect consistent naming conventions.

• Changed 'Hello World Starter' to 'Hello World example' in the C3 prompt documentation.
• Aligned terminology with the workers-sdk project standards.

Modified Files

• src/content/docs/pages/get-started/c3.mdx

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Looks good to me 🤙

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