Link markdown broken in display-installation-instuctions.md

[greenonline]

IN this file, display-installation-instuctions.md, the markdown for one link is broken and the text appears thusly:

As next step you need to configure password-less login. Procedure is described [here](../Hypriot-OS-Course-Preparation-Instructions.md#Configure password-less login)

The relative URL path (to Hypriot-OS-Course-Preparation-Instructions.md) is valid, but the markdown of the link is broken, such that the link is not clickable.