Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Doran's Ring - I suggest starting with Doran's Ring because it has everything you need to get first blood and to stay in the lane for a long time. Even though you'll have to sell it later for less than you paid, it will more than pay for the difference with all the lane-staying and/or kills it helps you get that you wouldn't have gotten with Mana Manipulator, Meki Pendant or Sapphire Crystal.