docs(create-index): align createIndex output with ascending index definition

[ThatDott]

The existing example in the docs creates an ascending index with { name: 1 },

collection.createIndex( { name : 1 }, function(err, result) {
  console.log(result);
  callback(result);
} )

But the resulting index list shows { name: -1 }.

[
  { v: 2, key: { _id: 1 }, name: '_id_' },
  { v: 2, key: { name: -1 }, name: 'name_-1' }
]

This change updates the output example to { name: 1 } so that it
matches the index definition and avoids confusion for readers.

Updated

[
  { v: 2, key: { _id: 1 }, name: '_id_' },
  { v: 2, key: { name: 1 }, name: 'name_1' }
]