suggestion for the first example in Render Props section

Currently the first example we see reads:

<DataProvider render={data => (
  <h1>Hello {data.target}</h1>
)}/>

Why not extend this initial example further and show what a DataProvider component might look like?
e.g. something like...

const DataProvider = props => {
  const data = {
    target: "World"
  }
  return props.render(data);
}

Granted, this is a fairly dumb example and not something you'd use a render prop for, but a dumb example might help solidify the basic concept before leading into more useful examples and conversations. Thoughts?

「Render Props」セクションを開き、最初の例を issue で提案されている DataProvider の例と併せて確認します。provider の実装と render prop の関係がより明確になるように導入例を更新します。後続の例に進む前に基本概念を理解できれば完了です。