title: Q: Richtext editor with h1 title and p subtitle
body: <p>Hi So i'm trying to make a richtext block where the First line will be a h1, and when u press enter u get to type a pharagraph, I tried using the multiline attribute with a value of "p" but that doesn't work,</p>
  
  <p>I wonder if anyone can help me out.</p>
  
  <p>This is my code so far.</p>
  
  <pre><code>   /**
   * Block dependencies
   */
  
  import './style.scss';
  
  /**
   * Internal block libraries
   */
  const { __ } = wp.i18n;
  const { registerBlockType } = wp.blocks;
  const { RichText } = wp.editor;
  
  /**
   * Register block
   */
  export default registerBlockType('my-plugin/header-2', {
      title: __('h1 Title'),
      description: __('h1 title'),
      icon: 'heart',
      category: 'common',
      keywords: [
          __('richtext-block'),
          __('weconnect'),
          __('h2')
      ],
      attributes: {
          content: {
              type: 'array',
              source: 'children',
              selector: 'h2',
          },
      },
      edit: function ({ attributes, setAttributes, className, isSelected }) {
          return (
              &lt;RichText
                  tagName="h2"
  
                  className={className}
                  value={attributes.content}
                  onChange={(content) =&gt; setAttributes({ content })}
                  placeholder={__('Enter text...', 'custom-block')}
                  keepPlaceholderOnFocus={true}
  
              /&gt;
          );
      },
      save: function( { attributes } ) {
          return (
              &lt;RichText.Content tagName="h2" value={ attributes.content } /&gt;
  
          );
      }
  });
  </code></pre>