go/packages: fix json struct tag on driverRequest.Command

Fixes golang/go#31181

Change-Id: I99bceb66809ed66393cc8e8deb5b82b8429ca337
Reviewed-on: https://go-review.googlesource.com/c/tools/+/170477
Run-TryBot: Michael Matloob <[email protected]>
Reviewed-by: Rebecca Stambler <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>

Author: matloob

go/packages/external.go

@@ -18,7 +18,7 @@ import (
 
 // Driver
 type driverRequest struct {
-	Command    string            `json "command"`
+	Command    string            `json:"command"`
 	Mode       LoadMode          `json:"mode"`
 	Env        []string          `json:"env"`
 	BuildFlags []string          `json:"build_flags"`

go/packages/packages.go

@@ -137,7 +137,7 @@ type Config struct {
 	BuildFlags []string
 
 	// Fset provides source position information for syntax trees and types.
-	// If Fset is nil, the loader will create a new FileSet.
+	// If Fset is nil, Load will use a new fileset, but preserve Fset's value.
 	Fset *token.FileSet
 
 	// ParseFile is called to read and parse each file