add dangerouslySetInnerHTML in js code example

Example 1: dangerouslySetInnerHTML

//https://flaviocopes.com/react-fix-dangerouslysetinnerhtml-did-not-match/

<div
  dangerouslySetInnerHTML={{
    __html: '<p>test</p>'
  }}></div>

Example 2: dangerouslySetInnerHTML

function createMarkup() {
    return {
       __html: 'First · Second'    };
 }; 

<div dangerouslySetInnerHTML={createMarkup()} />