message: Fix typo in Go tutorial
diff: @@ -653,14 +653,14 @@ our `orc` Monster, lets create some `Weapon`s: a `Sword` and an `Axe`.
  // Create the first `Weapon` ("Sword").
  sample.WeaponStart(builder)
  - sample.Weapon.AddName(builder, weaponOne)
  - sample.Weapon.AddDamage(builder, 3)
  + sample.WeaponAddName(builder, weaponOne)
  + sample.WeaponAddDamage(builder, 3)
  sword := sample.WeaponEnd(builder)
  // Create the second `Weapon` ("Axe").
  sample.WeaponStart(builder)
  - sample.Weapon.AddName(builder, weaponTwo)
  - sample.Weapon.AddDamage(builder, 5)
  + sample.WeaponAddName(builder, weaponTwo)
  + sample.WeaponAddDamage(builder, 5)
  axe := sample.WeaponEnd(builder)
  ~~~
  </div>
  