Using a @state in a dialog

[Lars-jnk]

You have a example in the section "Resizable" in the doc (https://vaadin.com/docs/latest/components/dialog#resizable). But you find it only if you look at the code. And I really didn't expected something about the state there.
Maybe rename it to "Resizable and State" and write a few words about that.

[yuriy-fix]

Lit renderers could be explained in some article.