* replace deprecated flag with new flag * rework liquid versioning in article * update flag descriptions to latest * fix table formatting * more table formatting * Apply suggestions from code review Co-authored-by: Andrew Eisenberg <aeisenberg@github.com> * address latest review comments * version new flag for GHES 3.1+ only * fix list numbeting Co-authored-by: Andrew Eisenberg <aeisenberg@github.com>