add more defaykt header in axios code example

Example 1: axios default headers authorization

axios.defaults.headers.common['Authorization'] = AUTH_TOKEN;

Example 2: axios defaults headers common

function getUserAccount() {
  return axios.get('/user/12345');
}

function getUserPermissions() {
  return axios.get('/user/12345/permissions');
}

axios.all([getUserAccount(), getUserPermissions()])
  .then(axios.spread(function (acct, perms) {
    // Both requests are now complete
  }));