time.c scale wrong in description

[sigilante]

Both of these functions in time.c are labeled microseconds:

/* u3_time_fsc_out: unix microseconds from urbit fracto-seconds.
*/
c3_w
u3_time_fsc_out(c3_d ufc_d)
{
  return (c3_w) (((ufc_d >> 48ULL) * 1000000ULL) / 65536ULL);
}

/* u3_time_msc_out: unix microseconds from urbit fracto-seconds.
*/
c3_w
u3_time_msc_out(c3_d ufc_d)
{
  return (c3_w) (((ufc_d >> 48ULL) * 1000ULL) / 65536ULL);
}