[krbdev.mit.edu #7455] Documentation: table formating and ref correction in MIT features

[Zhanna Tsitkova via RT]

Few issues:
1. Do not tie KFW 4.0 to 1.11 release.   
2. Improve Quick facts table structure with regard to the following
cells: Platforms, PRNG and pre-auth mechanisms
3. Clarify reference to GS2