edits+readability: rs-expand

Old
---
file: build/rs-expand/json/tutorial/expand-replica-set.json
source: source/tutorial/expand-replica-set.txt
stats:
   coleman-liau: 10.012979591836732
   flesch-ease: 50.723813303099035
   flesch-level: 10.692879818594108
   foggy:
      count: 55
      factor: 0.05612244897959184
      threshold: 3
   sentence-count: 54
   sentence-len-avg: 18
   smog-index: 8.89449942723447
   word-count: 980
New
---
file: build/rs-expand/json/tutorial/expand-replica-set.json
source: source/tutorial/expand-replica-set.txt
stats:
   coleman-liau: 9.497071129707113
   flesch-ease: 52.52360278482752
   flesch-level: 9.826733658001235
   foggy:
      count: 52
      factor: 0.05439330543933055
      threshold: 3
   sentence-count: 61
   sentence-len-avg: 15
   smog-index: 8.403604778245793
   word-count: 956