client API: correct an outdated comment

libmpv/client.h

@@ -785,8 +785,7 @@ typedef enum mpv_format {
     MPV_FORMAT_NODE_MAP         = 8,
     /**
      * A raw, untyped byte array. Only used only with mpv_node, and only in
-     * some very special situations. (Currently, only for the screenshot-raw
-     * command.)
+     * some very specific situations. (Some commands use it.)
      */
     MPV_FORMAT_BYTE_ARRAY       = 9
 } mpv_format;