* docs/grub.texi (serial): Remove obsolete comment about GRUB

needing to be compiled with serial support.
(ls): Indicate that multiple files are accepted.
* grub-core/commands/ls.c (GRUB_MOD_INIT): Update help text to
indicate that multiple files are accepted.

grub-core/commands/ls.c

@@ -270,7 +270,7 @@ static grub_extcmd_t cmd;
 GRUB_MOD_INIT(ls)
 {
   cmd = grub_register_extcmd ("ls", grub_cmd_ls, 0,
-			      N_("[-l|-h|-a] [FILE]"),
+			      N_("[-l|-h|-a] [FILE ...]"),
 			      N_("List devices and files."), options);
 }