Currently the document Benefits of hosting Jira Align in a VPC environment, there is the following mentions the site-to-site VPN for VPC offer:

Key benefits of moving to the VPC, or dedicated cloud environment

• 
  Better performance
• 
  Customer-managed keys for encryption at rest
• 
  Data center selection

• Logging data transfer

• 
  Ability to audit at will

• Pen testing

• 
  Custom requirements such as site-to-site VPN

This used to be supported but is no longer offered and the documentation is out of date.
This request is to update this page by removing this part:

• Custom requirements such as site-to-site VPN