[Twig Bridge] Add PHPdoc information to some email methods

Mime/WrappedTemplatedEmail.php

@@ -35,6 +35,12 @@ public function toName(): string
         return $this->message->getTo()[0]->getName();
     }
 
+    /**
+     * @param string $image            A Twig path to the image file. It's recommended to define
+     *                                 some Twig namespace for email images (e.g. '@email/images/logo.png').
+     * @param string|null $contentType The media type (i.e. MIME type) of the image file (e.g. 'image/png').
+     *                                 Some email clients require this to display embedded images.
+     */
     public function image(string $image, string $contentType = null): string
     {
         $file = $this->twig->getLoader()->getSourceContext($image);
@@ -47,6 +53,13 @@ public function image(string $image, string $contentType = null): string
         return 'cid:'.$image;
     }
 
+    /**
+     * @param string $file             A Twig path to the file. It's recommended to define
+     *                                 some Twig namespace for email files (e.g. '@email/files/contract.pdf').
+     * @param string|null $name        A custom file name that overrides the original name of the attached file.
+     * @param string|null $contentType The media type (i.e. MIME type) of the file (e.g. 'application/pdf').
+     *                                 Some email clients require this to display attached files.
+     */
     public function attach(string $file, string $name = null, string $contentType = null): void
     {
         $file = $this->twig->getLoader()->getSourceContext($file);