cmd/internal/browser: fix typo

Change-Id: I3c31f10c1082c7bc57aac18856014c55f79e0fed
Reviewed-on: https://go-review.googlesource.com/37409Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/internal/browser/browser.go

@@ -49,7 +49,7 @@ func Open(url string) bool {
 	return false
 }
 
-// appearsSuccessful reports whether the command appears to have run succesfully.
+// appearsSuccessful reports whether the command appears to have run successfully.
 // If the command runs longer than the timeout, it's deemed successful.
 // If the command runs within the timeout, it's deemed successful if it exited cleanly.
 func appearsSuccessful(cmd *exec.Cmd, timeout time.Duration) bool {