top: document a debugging script

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

procps/top.c

@@ -30,6 +30,15 @@
  *
  * Licensed under GPLv2, see file LICENSE in this source tree.
  */
+/* Howto snapshot /proc for debugging top problems:
+ * for f in /proc/[0-9]*""/stat; do
+ *         n=${f#/proc/}
+ *         n=${n%/stat}_stat
+ *         cp $f $n
+ * done
+ * cp /proc/stat /proc/meminfo .
+ * top -bn1 >top.out
+ */
 
 #include "libbb.h"