Update the gdk geo instruction - adding a secondary

What does this Merge Request do?

As the forms are redesigned a while ago, we need to replace the image and the instruction.

Merge Request checklist

• Tests added for new functionality. If not, please raise Issue to follow-up.
• This change is backward compatible. If not, please include steps to communicate to our users.
• Documentation added/updated, if needed.
• gdk doctor test added, if needed.