go.tools/cmd/godoc: update import paths

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/13770043

cmd/godoc/blog.go

@@ -14,7 +14,7 @@ import (
 	"runtime"
 	"sync"
 
-	"code.google.com/p/go.tools/godoc/blog"
+	"code.google.com/p/go.tools/blog"
 )
 
 const (

cmd/godoc/play.go

@@ -12,7 +12,7 @@ import (
 
 	// This package registers "/compile" and "/share" handlers
 	// that redirect to the golang.org playground.
-	_ "code.google.com/p/go.tools/godoc/playground"
+	_ "code.google.com/p/go.tools/playground"
 )
 
 func init() {