docs(www): fix combobox-form code example, pass value instead of label as prop

[pedrostanzani]

Modifies the "combobox-form" code example: https://ui.shadcn.com/docs/components/combobox#form

In the current code example, language.label gets passed down as a prop to the CommandItem component.

  {languages.map((language) => (
    <CommandItem
      value={language.label}  // <--- here
      key={language.value}
      onSelect={() => {
        form.setValue("language", language.value)
      }}
    >
    // ...

This PR modifies this snippet so that it passes language.value as a prop instead:

  {languages.map((language) => (
    <CommandItem
      value={language.value}  // <--- here
      key={language.value}
      onSelect={() => {
        form.setValue("language", language.value)
      }}
    >
    // ...

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