Update docs/Klarna-Activation.md
Update docs/Klarna-Activation.md

Co-authored-by: King-Hin Leung <d428d1fcf7f61567f5f694b83d044355f4ec024d@users.noreply.github.com>
commercetools/commercetools-payone-integration,commercetools/commercetools-payone-integration