documentation

Pull request #2429: Feature/DEV-2623 6.0 D

Merge in WEB/documentation from feature/DEV-2623-6.0-D to release/6.0

* commit '221f2bb005322bc28d162e5bd379ef9201f9d720':
  DEV-2623 removed internal comments.
  DEV-2623 deleted non-implemented approach.
  DEV-2623 documented suggested approaches.
  DEV-2623 initial draft for securing session cookies section.