Corrects typos and provide clarification

Closes-Bug: #1352053
Minor ormatting, capitalization and verb tense corrections
Corrections to IP addresses in some examples and replacing "VIP" with "virtual IP" for simplicity.
Calling out split-brain possibility in 2-node cluster with required quorum override
Amended with feedback from Andreas Jaeger and Christian Berendt on patch set 1 and 2

Change-Id: I1cc532d73483ad82d1ceaec92a8caf11071a7d0e
Merge "Corrects typos and provide clarification"