doc: fix typo in go_for_cpp_programmers.html

R=rsc, gri
CC=golang-dev
https://golang.org/cl/2191043
diff --git a/doc/go_for_cpp_programmers.html b/doc/go_for_cpp_programmers.html
index 33e3412..fae2ec4 100644
--- a/doc/go_for_cpp_programmers.html
+++ b/doc/go_for_cpp_programmers.html
@@ -668,7 +668,7 @@
 	var val int = 0
 	for {
 		c := <- ch
-		if c.get { c.val = val ch <- c }
+		if c.get { c.val = val; ch <- c }
 		else { val = c.val }
 	}
 }