HeaderMixin.php

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<?php
namespace Magento\Setup\Model\Description\Mixin;

class HeaderMixin implements DescriptionMixinInterface
{
    public function apply($text)
    {
        $paragraphs = explode(PHP_EOL, trim($text));
        $magicLengthNumber = 10;

        foreach ($paragraphs as &$paragraph) {
            $rawText = trim(strip_tags($paragraph));
            if (empty($rawText)) {
                continue;
            }

            $headerText = substr($rawText, 0, strpos($rawText, ' ', $magicLengthNumber));
            $paragraph = '<h1>' . $headerText . '</h1>' . PHP_EOL . $paragraph;
        }

        return implode(PHP_EOL, $paragraphs);
    }
}