#### Improve comment format in inexact tuples (#18616 by @fisker)

<!-- prettier-ignore -->
```flow
// Input
type A = [// comment
...];
type B = [/* comment */...];

// Prettier stable
type A = [...
  // comment
];
type B = [...
  /* comment */
];

// Prettier main
type A = [
  ...// comment
];
type B = [.../* comment */];
```
