Avoid "online serving system".

Author: beorn7

prometheus/histogram.go

@@ -50,9 +50,9 @@ type Histogram interface {
 
 var (
 	// DefBuckets are the default Histogram buckets. The default buckets are
-	// tailored to broadly measure response time in seconds for a typical online
-	// serving system. Most likely, however, you will be required to define buckets
-	// customized to your use case.
+	// tailored to broadly measure the response time (in seconds) of a
+	// network service. Most likely, however, you will be required to define
+	// buckets customized to your use case.
 	DefBuckets = []float64{.005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5, 10}
 
 	errBucketLabelNotAllowed = fmt.Errorf(