message: Fix typos in C++ tutorial
  CreateMonster and MonsterBuilder examples fixed for C++
diff: @@ -949,15 +949,18 @@ can serialize the monster itself:
  <div class="language-cpp">
  ~~~{.cpp}
  + // Create the position struct
  + auto position = Vec3(1.0f, 2.0f, 3.0f);
  +
  // Set his hit points to 300 and his mana to 150.
  int hp = 300;
  int mana = 150;
  // Finally, create the monster using the `CreateMonster` helper function
  // to set all fields.
  - auto orc = CreateMonster(builder, Vec3(1.0f, 2.0f, 3.0f), mana, hp, name,
  - inventory, Color_Red, weapons, Equipment_Weapon,
  - axe.Union(), path);
  + auto orc = CreateMonster(builder, &position, mana, hp, name, inventory,
  + Color_Red, weapons, Equipment_Weapon, axe.Union(),
  + path);
  ~~~
  </div>
  <div class="language-java">
  @@ -1120,15 +1123,14 @@ a bit more flexibility.
  // You can use this code instead of `CreateMonster()`, to create our orc
  // manually.
  MonsterBuilder monster_builder(builder);
  - monster_builder.add_pos(&pos);
  - auto pos = Vec3(1.0f, 2.0f, 3.0f);
  + monster_builder.add_pos(&position);
  monster_builder.add_hp(hp);
  monster_builder.add_name(name);
  monster_builder.add_inventory(inventory);
  monster_builder.add_color(Color_Red);
  monster_builder.add_weapons(weapons);
  monster_builder.add_equipped_type(Equipment_Weapon);
  - monster_builder.add_equpped(axe.Union());
  + monster_builder.add_equipped(axe.Union());
  auto orc = monster_builder.Finish();
  ~~~
  </div>
  