HTMLDialogElement is missing

### Expected Behaviour
`HTMLDialogElement.showModal()` has argument as option
so you can specify dialog size and title

e.g.
```JS
HTMLDialogElement.showModal({
title: title,
size: {
width: 300,
},
});
```

### Actual Behaviour
`HTMLDialogElement.showModal()` has no argument

Locate the type declaration for HTMLDialogElement and inspect the showModal signature. Use the issue's title and size example as the requested shape; the work is done when the declaration accepts those options and existing type checks still pass.

Written by the indexing model from the issue text.