fix comment for closing channel

[lxl-renren]

j, more := <-jobs, if channel jobs is closed, j is not always zero value, and more is also not always false.

Following are the test example.

package main

import (
"fmt"
"time"
)

func main() {
jobs := make(chan int, 5)
done := make(chan bool)

go func() {
	time.Sleep(time.Minute)
    for j := 1; j <= 2; j++ {
        j, more := <-jobs
        if more {
            fmt.Println("received job", j)
        } else {
            fmt.Println("received all jobs")
        }
    }
	done <- true
}()

for j := 1; j <= 3; j++ {
    jobs <- j
    fmt.Println("sent job", j)
}
close(jobs)
fmt.Println("sent all jobs")

<-done

t, ok := <-jobs
fmt.Println("received more jobs:", t, ok)

t, ok = <-jobs
fmt.Println("received more jobs:", t, ok)	

}

[lixiaolian@YBBJ-1100637deMacBook-Pro example]$go run valus.go
sent job 1
sent job 2
sent job 3
sent all jobs
received job 1
received job 2
received more jobs: 3 true
received more jobs: 0 false

[eliben]

Sorry, I don't understand this change. The comment seems to be in line with the spec https://go.dev/ref/spec#Receive_operator

Can you clarify what's wrong with this?