Fix documented types for setConditions()

Refs #11767

src/ORM/Association.php

@@ -456,7 +456,7 @@ public function target(Table $table = null)
      * Sets a list of conditions to be always included when fetching records from
      * the target association.
      *
-     * @param array $conditions list of conditions to be used
+     * @param array|callable $conditions list of conditions to be used
      * @see \Cake\Database\Query::where() for examples on the format of the array
      * @return $this
      */