edits+readability: rs-remove-member

Old
---
file: build/rs-remove/json/tutorial/remove-replica-set-member.json
source: source/tutorial/remove-replica-set-member.txt
stats:
   coleman-liau: 9.581293532338304
   flesch-ease: 51.9180325644505
   flesch-level: 10.557259158751695
   foggy:
      count: 4
      factor: 0.01990049751243781
      threshold: 3
   sentence-count: 11
   sentence-len-avg: 18
   smog-index: 6.574015621080383
   word-count: 201
New
---
file: build/rs-remove/json/tutorial/remove-replica-set-member.json
source: source/tutorial/remove-replica-set-member.txt
stats:
   coleman-liau: 8.032777777777778
   flesch-ease: 64.144
   flesch-level: 7.8898888888888905
   foggy:
      count: 0
      factor: 0.0
      threshold: 3
   sentence-count: 10
   sentence-len-avg: 14
   smog-index: 3.1291
   word-count: 144