sync: fix example code

Fixes #1631.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4303046

diff --git a/src/pkg/sync/waitgroup.go b/src/pkg/sync/waitgroup.go
index 68e1d509f4811c8161901396fd880f2d098289e7..05478c630667eb705515e91305b331a850d49c45 100644 (file)
--- a/src/pkg/sync/waitgroup.go
+++ b/src/pkg/sync/waitgroup.go
@@ -22,7 +22,7 @@ import "runtime"
 //       go func() {
 //           // Do something.
 //           wg.Done()
-//       }
+//       }()
 //   }
 //   wg.Wait()
 //