misc/ios: remove note from output of detect.go

If no GOIOS_DEV_ID is set, iostest.bash will eval the output of
detect.go. Prepend the note output by detect.go with # to make
the shell ignore it.

Went undetected for so long because the iOS builders usually run
with GOIOS_DEV_ID set.

Change-Id: I308eac94803851620ca91593f9a1aef79825187f
Reviewed-on: https://go-review.googlesource.com/c/144109
Run-TryBot: Elias Naur <elias.naur@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

misc/ios/detect.go

@@ -33,9 +33,9 @@ func main() {
 		fail("did not find mobile provision matching device udids %q", udids)
 	}
 
-	fmt.Println("Available provisioning profiles below.")
-	fmt.Println("NOTE: Any existing app on the device with the app id specified by GOIOS_APP_ID")
-	fmt.Println("will be overwritten when running Go programs.")
+	fmt.Println("# Available provisioning profiles below.")
+	fmt.Println("# NOTE: Any existing app on the device with the app id specified by GOIOS_APP_ID")
+	fmt.Println("# will be overwritten when running Go programs.")
 	for _, mp := range mps {
 		fmt.Println()
 		f, err := ioutil.TempFile("", "go_ios_detect_")