Fix @return documentation in WANObjectCache::prefixCacheKeys()

Change-Id: Iff27ad3b034b4702f329437950b69731de29171c

diff --git a/includes/libs/objectcache/WANObjectCache.php b/includes/libs/objectcache/WANObjectCache.php
index 6e5cad6..be62d1a 100755 (executable)
--- a/includes/libs/objectcache/WANObjectCache.php
+++ b/includes/libs/objectcache/WANObjectCache.php
@@ -572,7 +572,7 @@ class WANObjectCache {
        /**
         * @param array $keys
         * @param string $prefix
-        * @return string
+        * @return string[]
         */
        protected static function prefixCacheKeys( array $keys, $prefix ) {
                $res = array();