Update ntp/metadata.csv descriptions to include precision (DataDog#23960)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ian28223

ntp/metadata.csv

@@ -1,3 +1,3 @@
 metric_name,metric_type,interval,unit_name,per_unit_name,description,orientation,integration,short_name,curated_metric
-ntp.offset,gauge,,second,,The time difference between the NTP reference clock and the local clock.,-1,system,ntp offset,
-ntp.intake_offset,gauge,,second,,"The time difference between the Datadog intake server clock and the local clock, derived from the HTTP Date response header. Available from Agent 7.79.",-1,system,ntp intake offset,
+ntp.offset,gauge,,second,,The time difference between the NTP reference clock and the local clock. Precision: milliseconds.,-1,system,ntp offset,
+ntp.intake_offset,gauge,,second,,"Time difference between the Datadog intake server clock and the local clock, derived from the HTTP Date response header. Precision: seconds. Available from Agent 7.79.",-1,system,ntp intake offset,