:pencil2: Fix typo in the getting started doc

[ClementVanPeuter]

Prerequisites

• [x] I have read the Contributing guidelines
• [x] I have read the Code of conduct and I agree with it

Description

Fixing a typo in the getting started doc.

Before

 const newAnimals = {
  ...animals,
  weasels: {
    ...animals.weasels,
    lutraLutra: {
      ...animals.weasels.otter,
      name: 'Lutra lutra',
    },
  },
}

After

const newAnimals = {
  ...animals,
  weasels: {
    ...animals.weasels,
    otter: {
      ...animals.weasels.lutraLutra,
      name: 'Lutra lutra',
    },
  },
}

[frinyvonnick]

This should be 😄

const newAnimals = {
  ...animals,
  weasels: {
    ...animals.weasels,
    lutraLutra: {
      ...animals.weasels.lutraLutra,
      name: 'Lutra lutra',
    },
  },
}

Edit: @nlepage has been faster 👍