strings: make Count example show results

Thanks to dr.volker.dobler for tracking this down.

Filed a long-term issue (3142) which may eventually
resolve this problem w/o the need for a manual fix.

R=iant
CC=golang-dev
https://golang.org/cl/5698078

src/pkg/strings/example_test.go

@@ -41,6 +41,7 @@ func ExampleContainsAny() {
 func ExampleCount() {
 	fmt.Println(strings.Count("cheese", "e"))
 	fmt.Println(strings.Count("five", "")) // before & after each rune
+
 	// Output:
 	// 3
 	// 5