perf_counter tools: fix comment for sym_weight()

Signed-off-by: NWu Fengguang <fengguang.wu@intel.com>
Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Documentation/perf_counter/kerneltop.c

@@ -473,7 +473,7 @@ static struct sym_entry		sym_table[MAX_SYMS];
 static void show_details(struct sym_entry *sym);
 
 /*
- * Ordering weight: count-1 * count-1 * ... / count-n
+ * Ordering weight: count-1 * count-2 * ... / count-n
  */
 static double sym_weight(const struct sym_entry *sym)
 {