doc/progs: gofmt -w

R=r, gri, r
CC=golang-dev
https://golang.org/cl/4662085
diff --git a/doc/progs/sieve1.go b/doc/progs/sieve1.go
index e785e20..e1411a3 100644
--- a/doc/progs/sieve1.go
+++ b/doc/progs/sieve1.go
@@ -9,7 +9,7 @@
 // Send the sequence 2, 3, 4, ... to returned channel 
 func generate() chan int {
 	ch := make(chan int)
-	go func(){
+	go func() {
 		for i := 2; ; i++ {
 			ch <- i
 		}
@@ -22,7 +22,7 @@
 	out := make(chan int)
 	go func() {
 		for {
-			if i := <-in; i % prime != 0 {
+			if i := <-in; i%prime != 0 {
 				out <- i
 			}
 		}