readability+edits: priority-0 member

Before
---
file: build/rs-priority-zero/json/core/replica-set-priority-0-member.json
source: source/core/replica-set-priority-0-member.txt
stats:
   coleman-liau: 9.858789625360231
   flesch-ease: 44.75171031199099
   flesch-level: 10.76538278411227
   foggy:
      count: 33
      factor: 0.09510086455331412
      threshold: 3
   sentence-count: 23
   sentence-len-avg: 15
   smog-index: 9.971965246562196
   word-count: 347

After:
---
file: build/master/json/core/replica-set-priority-0-member.json
source: source/core/replica-set-priority-0-member.txt
stats:
   coleman-liau: 10.45551282051282
   flesch-ease: 41.508184615384636
   flesch-level: 10.570148717948719
   foggy:
      count: 33
      factor: 0.10576923076923077
      threshold: 3
   sentence-count: 25
   sentence-len-avg: 12
   smog-index: 9.69254577184881
   word-count: 312