Add a friendly error for adjancent JSX element case:
```
× Adjacent JSX elements must be wrapped in an enclosing tag.
╭─[misc/fail/jsx-adjacent-elements.jsx:3:3]
2 │ <div />
3 │ <span />
· ─
4 │ );
╰────
help: Did you want a JSX fragment `<>...</>`?
```
This error message exists in babel.
sapphi-red