[release-branch.go1.10] cmd/godoc: add x/lint and x/vgo redirects

Update golang/go#25048

Change-Id: I6e21f167091338600c2a0a37411b0a565d27ce36
Reviewed-on: https://go-review.googlesource.com/96196
Run-TryBot: Andrew Bonventre <andybons@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
(cherry picked from commit 733d489)
Reviewed-on: https://go-review.googlesource.com/109095
Reviewed-by: Filippo Valsorda <filippo@golang.org>

Author: andybons

cmd/godoc/x.go

@@ -32,6 +32,7 @@ var xMap = map[string]xRepo{
 	"debug":      {"https://go.googlesource.com/debug", "git"},
 	"exp":        {"https://go.googlesource.com/exp", "git"},
 	"image":      {"https://go.googlesource.com/image", "git"},
+	"lint":       {"https://go.googlesource.com/lint", "git"},
 	"mobile":     {"https://go.googlesource.com/mobile", "git"},
 	"net":        {"https://go.googlesource.com/net", "git"},
 	"oauth2":     {"https://go.googlesource.com/oauth2", "git"},
@@ -46,6 +47,7 @@ var xMap = map[string]xRepo{
 	"time":       {"https://go.googlesource.com/time", "git"},
 	"tools":      {"https://go.googlesource.com/tools", "git"},
 	"tour":       {"https://go.googlesource.com/tour", "git"},
+	"vgo":        {"https://go.googlesource.com/vgo", "git"},
 }
 
 func init() {