Diversity
No, this is not what is meant. Remember that diversity is not just limited to ethnic minorities and women. You should select the best people for the job and you are encouraged to select team members with a rich set of ideas, different backgrounds and perspectives to contribute to the project.
One way to encourage diversity is to ask for, respect and consider the different views of your colleagues. By appreciating the differences that exist amongst your team members, you are creating an environment that promotes collaboration and builds effective teams.