edits+readability: rs-replace-member

Old
---
file: build/rs-replace/json/tutorial/replace-replica-set-member.json
source: source/tutorial/replace-replica-set-member.txt
stats:
   coleman-liau: 11.372450331125826
   flesch-ease: 44.58619757174395
   flesch-level: 13.292549668874177
   foggy:
      count: 4
      factor: 0.026490066225165563
      threshold: 3
   sentence-count: 6
   sentence-len-avg: 25
   smog-index: 7.793537801064561
   word-count: 151
New
---
file: build/rs-replace/json/tutorial/replace-replica-set-member.json
source: source/tutorial/replace-replica-set-member.txt
stats:
   coleman-liau: 11.559030303030301
   flesch-ease: 46.95153409090912
   flesch-level: 11.834356060606058
   foggy:
      count: 4
      factor: 0.024242424242424242
      threshold: 3
   sentence-count: 8
   sentence-len-avg: 20
   smog-index: 7.168621630094336
   word-count: 165