time: fix godoc for After and NewTicker.

R=golang-dev, gri, bradfitz, iant
CC=golang-dev, rsc
https://golang.org/cl/5523049

src/pkg/time/sleep.go

@@ -41,7 +41,7 @@ func (t *Timer) Stop() (ok bool) {
 }
 
 // NewTimer creates a new Timer that will send
-// the current time on its channel after at least ns nanoseconds.
+// the current time on its channel after at least duration d.
 func NewTimer(d Duration) *Timer {
 	c := make(chan Time, 1)
 	t := &Timer{
@@ -70,7 +70,7 @@ func sendTime(now int64, c interface{}) {
 
 // After waits for the duration to elapse and then sends the current time
 // on the returned channel.
-// It is equivalent to NewTimer(ns).C.
+// It is equivalent to NewTimer(d).C.
 func After(d Duration) <-chan Time {
 	return NewTimer(d).C
 }

src/pkg/time/tick.go

@@ -14,7 +14,7 @@ type Ticker struct {
 }
 
 // NewTicker returns a new Ticker containing a channel that will send the
-// time, in nanoseconds, with a period specified by the duration argument.
+// time with a period specified by the duration argument.
 // It adjusts the intervals or drops ticks to make up for slow receivers.
 // The duration d must be greater than zero; if not, NewTicker will panic.
 func NewTicker(d Duration) *Ticker {