Make guidance clear for ic-stepper compact variant

[gd2910]

What is the purpose of the work?

If a step-type of current is not passed to an ic-step then the stepper in compact variant will not render on smaller screens. Code guidance has compliant step-types throughout but it may be worth emphasising this point in the guidance tab of ic-stepper

Why do we need it?

This may help to prevent issues when devs are developing using ic-stepper in compact variant

[gd2910]

Stepper guidance will need to be reviewed in full with design team before ticket can be completed