initialism class should use text-capitalize()

Created by: gideoncresswell

Currently .initalism in type.less looks like this -

.initialism {
  font-size: 90%;
  text-transform: uppercase;
}

but it should take advantage of .text-capitalize defined above so it should be

.initialism {
  font-size: 90%;
  .text-capitalize();
}

in my opinion 😄