code: public ServerUpdater addRolesToUser(User user, Collection<Role> roles) {
          delegate.addRolesToUser(user, roles);
          return this;
      }
docs: Queues a collection of roles to be assigned to the user.
  
  @param user The server member the role should be added to.
  @param roles The roles which should be added to the server member.
  @return The current instance in order to chain call methods.