Image Previews docs typo

[phamduylong]

Link to the Page

https://next.skeleton.dev/docs/components/file-upload/svelte#image-previews

Describe the Issue (screenshots encouraged!)

Discord message

Correction:

function generatePreview(event) {
  const reader = new FileReader();
  reader.onload = (event) => {
    const image = event.target.result;
    // set the image as the src of an image element
  }
-  reader.readAsDataURL(details.acceptedFiles[0]);
+  reader.readAsDataURL(event.details.acceptedFiles[0]);
}

[phamduylong]

I'll throw a quick PR for this.