update inconsistent comment
@@ -25,7 +25,7 @@ import (
"github.com/prometheus/prometheus/storage"
)
-// Callback func that return the oldest timestamp stored in a storage.
+// startTimeCallback is a callback func that return the oldest timestamp stored in a storage.
type startTimeCallback func() (int64, error)
// Storage represents all the remote read and write endpoints. It implements
