perf metricgroup: Update comment on location of metric_event list

Update comment as the stat_config no longer holds all metrics.

Signed-off-by: Ian Rogers <[e-mail]>
Fixes: faebee18d720 ("perf stat: Move metric list from config to evlist")
Signed-off-by: Namhyung Kim <[e-mail]>

tools/perf/util/metricgroup.h

···
 
 /**
  * A node in a rblist keyed by the evsel. The global rblist of metric events
- * generally exists in perf_stat_config. The evsel is looked up in the rblist
+ * generally exists in evlist. The evsel is looked up in the rblist
  * yielding a list of metric_expr.
  */
 struct metric_event {