Fix tutorial instruction

[ianjmacintosh]

Summary

Changed npm start -> npm run dev

npm start throws an error since it isn't a defined run script

I used the more verbose syntax to make it more obvious the user is calling a run script, not running an npm command named "dev"

Screenshots (optional)

n/a

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Updated tutorial instructions to correct the command for starting the development server.

• Changed npm start to npm run dev in the tutorial instructions
• Clarified the command usage to indicate it's a run script
• Ensured adherence to the documentation style guide

Modified Files

• src/content/docs/pages/tutorials/build-an-api-with-pages-functions/index.mdx

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[kodster28]

Thanks for finding / flagging, @ianjmacintosh.

Added the npm install bit as well based on my local testing.

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