trivial: correct parameter name in comments

src/scheduler.h

@@ -45,13 +45,13 @@ public:
     // Call func at/after time t
     void schedule(Function f, boost::chrono::system_clock::time_point t=boost::chrono::system_clock::now());
 
-    // Convenience method: call f once deltaSeconds from now
+    // Convenience method: call f once deltaMilliSeconds from now
     void scheduleFromNow(Function f, int64_t deltaMilliSeconds);
 
     // Another convenience method: call f approximately
-    // every deltaSeconds forever, starting deltaSeconds from now.
+    // every deltaMilliSeconds forever, starting deltaMilliSeconds from now.
     // To be more precise: every time f is finished, it
-    // is rescheduled to run deltaSeconds later. If you
+    // is rescheduled to run deltaMilliSeconds later. If you
     // need more accurate scheduling, don't use this method.
     void scheduleEvery(Function f, int64_t deltaMilliSeconds);