input: Write a python function to increment the 'age' field in a dictionary by 2.
  assert increment_age({'name': 'John', 'age': 28}) == {'name': 'John', 'age': 30}
  assert increment_age({'name': 'Alice', 'age': 34}) == {'name': 'Alice', 'age': 36}
  assert increment_age({'name': 'Bob', 'age': 25}) == {'name': 'Bob', 'age': 27}
output: def increment_age(person):
      person['age'] += 2
      return person