perf tools: Fix double word in comments

Delete the repeated word "to" in comments.
Signed-off-by: Nshaomin Deng <dengshaomin@cdjrlc.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20220807155549.30953-1-dengshaomin@cdjrlc.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/events_stats.h

@@ -22,7 +22,7 @@
  *
  * The total_period is needed because by default auto-freq is used, so
  * multiplying nr_events[PERF_EVENT_SAMPLE] by a frequency isn't possible to get
- * the total number of low level events, it is necessary to to sum all struct
+ * the total number of low level events, it is necessary to sum all struct
  * perf_record_sample.period and stash the result in total_period.
  */
 struct events_stats {