Update MessageRepository.php

Author: valzargaming

src/Discord/Repository/Guild/MessageRepository.php

@@ -67,9 +67,8 @@ class MessageRepository extends AbstractRepository
      *                           Supported parameters:
      *                           - sort_by: Sorting mode. See SortingMode schema.
      *                           - sort_order: Sorting order. See SortingOrder schema.
-     *                           - content: Message content to search for (string, max 1024 chars).
+     *                           - content: Message content to search for (array|string, max 1024 chars).
      *                           - slop: Integer, minimum 0, maximum 100.
-     *                           - contents: Array of message contents to search for (string|null, max 1024 chars each, up to 100 items).
      *                           - author_id: Author ID (SnowflakeType|null, up to 1521 unique items).
      *                           - author_type: Author type (AuthorType, up to 1521 unique items).
      *                           - mentions: Mentioned user ID (SnowflakeType|null, up to 1521 unique items).