Add missing return types

Author: wouterj

AbstractUriElement.php

@@ -115,6 +115,8 @@ protected function canonicalizePath(string $path): string
      *
      * @param \DOMElement $node A \DOMElement instance
      *
+     * @return void
+     *
      * @throws \LogicException If given node is not an anchor
      */
     abstract protected function setNode(\DOMElement $node);

Field/FormField.php

@@ -118,6 +118,8 @@ public function isDisabled(): bool
 
     /**
      * Initializes the form field.
+     *
+     * @return void
      */
     abstract protected function initialize();
 }