Reword "Checking for existing SSH key pair"

[fkohrt]

I had a few participants who stumbled upon the fact that during the step "Checking for existing SSH key pair" it is to be expected that no key can be found and the console actually should return an error message. If they would read on, they would understand this, but some apparently think that something went wrong and don't continue reading. Maybe the paragraph can be reworded such that people understand that after entering the command, it is to be expected that they get an error?