As suggested by jerome-benoit: remove comment

Author: alexfernandez

lib/internal/cluster/primary.js

@@ -44,7 +44,6 @@ cluster.SCHED_RR = SCHED_RR;      // Primary distributes connections.
 let ids = 0;
 let initialized = false;
 
-// XXX(alexfernandez) Folded cluster.schedulingPolicy into cluster.settings.
 let schedulingPolicy = process.env.NODE_CLUSTER_SCHED_POLICY;
 if (schedulingPolicy === 'rr')
   schedulingPolicy = SCHED_RR;