Use method param type hints instead of PHPDoc

Since we require PHP 7.4, contravariance in param types is supported,
so we do not need to worry about subclasses that widen the param type.
It will be only breaking in the unlikely case a subclass uses a type that
does not extend `DOMElement`, contradicting the PHPDoc type annotation.

Author: jtojnar

.php-cs-fixer.php

@@ -22,6 +22,7 @@
         'ordered_imports' => true,
         'php_unit_strict' => false,
         'phpdoc_order' => true,
+        'phpdoc_to_param_type' => true,
         // 'psr4' => true,
         'strict_comparison' => true,
         'strict_param' => true,

src/Readability.php

@@ -546,12 +546,8 @@ public function prepArticle(\DOMNode $articleContent): void
     /**
      * Get the inner text of a node.
      * This also strips out any excess whitespace to be found.
-     *
-     * @param \DOMElement $e
-     * @param bool        $normalizeSpaces (default: true)
-     * @param bool        $flattenLines    (default: false)
      */
-    public function getInnerText($e, bool $normalizeSpaces = true, bool $flattenLines = false): string
+    public function getInnerText(\DOMElement $e, bool $normalizeSpaces = true, bool $flattenLines = false): string
     {
         if (!isset($e->textContent) || '' === $e->textContent) {
             return '';