build system: tidying up CONFIG_xxx names (suggested by Rob)

diff --git a/util-linux/Config.in b/util-linux/Config.in
index 8cecc60..976507b 100644
--- a/util-linux/Config.in
+++ b/util-linux/Config.in
@@ -403,10 +403,8 @@
 	  unable to move the cursor.
 
 config VOLUMEID
-	bool "Routines for detecting label and uuid on common filesystems"
+	bool #No description makes it a hidden option
 	default n
-	help
-	  TODO
 
 config FEATURE_VOLUMEID_EXT
 	bool "Ext filesystem"