Fix `UserBirthdayCache::$birthdays` type documentation

diff --git a/wcfsetup/install/files/lib/system/user/UserBirthdayCache.class.php b/wcfsetup/install/files/lib/system/user/UserBirthdayCache.class.php
index 6a7997902aa16237b761a65583aa2b6f4660f869..54cfa916ac36452def2b7dffd32dbf97e0ccd880 100644 (file)
--- a/wcfsetup/install/files/lib/system/user/UserBirthdayCache.class.php
+++ b/wcfsetup/install/files/lib/system/user/UserBirthdayCache.class.php
@@ -20,7 +20,7 @@ class UserBirthdayCache extends SingletonFactory {
        
        /**
         * user birthdays
-        * @var integer[]
+        * @var integer[][]
         */
        protected $birthdays = [];