[css-flexbox-1] Appendix A: Axis Mappings main-start and main-end of column-reverse + wrap-reverse and column + wrap-reverse are the same

[funorpain]

Axis Mappings for ltr + horizontal-tb Writing Mode (e.g. English)

flex-flow	main axis	main-start	main-end
column + wrap-reverse	vertical	top	bottom
column-reverse + wrap-reverse	vertical	top (should be bottom)	bottom (should be top)

The following two tables have the same problem.

Appendix A: Axis Mappings
https://www.w3.org/TR/css-flexbox-1/#axis-mapping