cmd/go: fix go list usage line

CL 108156 added -cgo and -export,
but in the usage line it added -cgo and -list.
CL 117015 correctly added -export to the usage line.
All that remains is to remove -list.

Change-Id: I8cc5cfc78bc6b52080ae1b861f92620a8f18b53f
Reviewed-on: https://go-review.googlesource.com/118375
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/go/alldocs.go

@@ -579,7 +579,7 @@
 //
 // Usage:
 //
-// 	go list [-cgo] [-deps] [-e] [-export] [-f format] [-json] [-list] [-test] [build flags] [packages]
+// 	go list [-cgo] [-deps] [-e] [-export] [-f format] [-json] [-test] [build flags] [packages]
 //
 // List lists the packages named by the import paths, one per line.
 //

src/cmd/go/internal/list/list.go

@@ -23,7 +23,7 @@ import (
 )
 
 var CmdList = &base.Command{
-	UsageLine: "list [-cgo] [-deps] [-e] [-export] [-f format] [-json] [-list] [-test] [build flags] [packages]",
+	UsageLine: "list [-cgo] [-deps] [-e] [-export] [-f format] [-json] [-test] [build flags] [packages]",
 	Short:     "list packages",
 	Long: `
 List lists the packages named by the import paths, one per line.