cmd/go: fix minor typo in 'go bug'

Change-Id: I6bb594576e174cb0df8d25d11b84f5a4752ebfd6
Reviewed-on: https://go-review.googlesource.com/32683Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/go/bug.go

@@ -75,7 +75,7 @@ A link on play.golang.org is best.
 
 func printGoDetails(w io.Writer) {
 	printCmdOut(w, "GOROOT/bin/go version: ", filepath.Join(runtime.GOROOT(), "bin/go"), "version")
-	printCmdOut(w, "GOROOT/bin/go tool compile -v: ", filepath.Join(runtime.GOROOT(), "bin/go"), "tool", "compile", "-V")
+	printCmdOut(w, "GOROOT/bin/go tool compile -V: ", filepath.Join(runtime.GOROOT(), "bin/go"), "tool", "compile", "-V")
 }
 
 func printOSDetails(w io.Writer) {