Updated

• Platform > Limited Beta for Akamai's New Data Centers: Removed data centers already in GA and added London (gb-lon) and Melbourne (au-mel)
• Compute Instances > Work with Placement Groups: Updated screenshot and corresponding steps.

Fixed

• Marketplace Apps > Deploy OpenLiteSpeed Django through the Linode Marketplace: Fixed output shortcode.
• Minor typos in 'An Overview of the Cloud Manager' and 'Linode Kubernetes Engine'