fix(docs): make docs accurate to callout behaviour (closes #920)

Jacky Zhao

2024-02-23 be9b6b3a1e2038ea0a985ebd37fb18a661bddd04

 quartz/components/Header.tsx

@@ -1,6 +1,6 @@
import { QuartzComponentConstructor, QuartzComponentProps } from "./types"
import { QuartzComponent, QuartzComponentConstructor, QuartzComponentProps } from "./types"

function Header({ children }: QuartzComponentProps) {
const Header: QuartzComponent = ({ children }: QuartzComponentProps) => {
  return children.length > 0 ? <header>{children}</header> : null
}