Added comment for the unescape function

Author: h44z

src/VCardParser.php

@@ -308,6 +308,14 @@ protected function parseAddress($value)
         );
     }
 
+    /**
+     * Unescape newline characters according to RFC2425 section 5.8.4.
+     * This function will replace escaped line breaks with PHP_EOL.
+     *
+     * @link http://tools.ietf.org/html/rfc2425#section-5.8.4
+     * @param  string $text
+     * @return string
+     */
     protected function unescape($text)
     {
         return str_replace("\\n", PHP_EOL, $text);