[Docs Site] add missing type highlighting to c3.mdx

[minddust]

Summary

Add missing type highlighting according to https://developers.cloudflare.com/style-guide/components/type-highlighting/

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.

[minddust]

hey @kodster28 :) i tagged you because you reviewed other docs PRs as well and this one is getting stale. Maybe you could take this over? 🙃

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PR Change Summary

Added missing type highlighting to the documentation for better clarity and adherence to the style guide.

• Implemented type highlighting for various CLI options in c3.mdx
• Updated documentation to follow the Cloudflare style guide
• Ensured consistency in the presentation of optional parameters

Modified Files

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

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