Combobox docs missing

[JonKaric]

The link linking to the combo box in this section

https://statamic.dev/getting-started/upgrade-guide/vue-2-to-3#removals

links to

https://ui.statamic.dev/?path=/docs/components-combobox

[duncanmcclean]

The Combobox component is currently missing from Storybook. I've actually just opened a PR to add it (amongst other changes): statamic/cms#13843

For now though, all of the props/slots/events documented on the Select are also supported by the Combobox, so you can reference its docs instead. https://ui.statamic.dev/?path=/docs/forms-select--docs