edits+readability: replica-set-delayed-member

Before:
---
file: build/master/json/core/replica-set-delayed-member.json
source: source/core/replica-set-delayed-member.txt
stats:
   coleman-liau: 10.328025078369905
   flesch-ease: 42.56970950888194
   flesch-level: 12.604940438871473
   foggy:
      count: 22
      factor: 0.06896551724137931
      threshold: 3
   sentence-count: 15
   sentence-len-avg: 21
   smog-index: 10.047579312681364
   word-count: 319

After:
---
file: build/master/json/core/replica-set-delayed-member.json
source: source/core/replica-set-delayed-member.txt
stats:
   coleman-liau: 9.635205047318614
   flesch-ease: 49.16371594493836
   flesch-level: 9.981595927731572
   foggy:
      count: 23
      factor: 0.07255520504731862
      threshold: 3
   sentence-count: 22
   sentence-len-avg: 14
   smog-index: 8.97023862654752
   word-count: 317