edit+readability: rs-architectures

BEFORE

file: build/master/json/core/.json
source: source/core/replica-set-architectures.txt
stats:
   coleman-liau: 14.255014005602241
   flesch-ease: 29.54934629665823
   flesch-level: 13.262844765813306
   foggy:
      count: 81
      factor: 0.1134453781512605
      threshold: 3
   sentence-count: 43
   sentence-len-avg: 16
   smog-index: 10.969770756190233
   word-count: 714

AFTER

file: build/master/json/core/replica-set-architectures.json
source: source/core/replica-set-architectures.txt
stats:
   coleman-liau: 12.615140186915884
   flesch-ease: 40.02162305295951
   flesch-level: 11.221352024922119
   foggy:
      count: 52
      factor: 0.08099688473520249
      threshold: 3
   sentence-count: 45
   sentence-len-avg: 14
   smog-index: 9.27011772238663
   word-count: 642