GEODE-1531: Improve README.md for replicated example
GEODE-1531: Improve README.md for replicated example

- Improved the appearance of the markdown

- Added commands for how to kill a single server

- Added last step to run scripts/stopAll.sh so the system is
  shut down when the example ends, not leaving a locator and
  a server running

- Improved the prose describing what the example does

shankarh/geode,PurelyApplied/geode,smanvi-pivotal/geode,masaki-yamakawa/geode,PurelyApplied/geode,pdxrunner/geode,smgoller/geode,PurelyApplied/geode,smanvi-pivotal/geode,jdeppe-pivotal/geode,davinash/geode,shankarh/geode,pivotal-amurmann/geode,prasi-in/geode,masaki-yamakawa/geode,pivotal-amurmann/geode,davebarnes97/geode,pdxrunner/geode,deepakddixit/incubator-geode,charliemblack/geode,davebarnes97/geode,deepakddixit/incubator-geode,prasi-in/geode,pdxrunner/geode,deepakddixit/incubator-geode,charliemblack/geode,pivotal-amurmann/geode,PurelyApplied/geode,jdeppe-pivotal/geode,masaki-yamakawa/geode,smanvi-pivotal/geode,davinash/geode,pdxrunner/geode,deepakddixit/incubator-geode,prasi-in/geode,smgoller/geode,davebarnes97/geode,shankarh/geode,charliemblack/geode,pivotal-amurmann/geode,smgoller/geode,smgoller/geode,PurelyApplied/geode,jdeppe-pivotal/geode,deepakddixit/incubator-geode,davebarnes97/geode,smgoller/geode,davebarnes97/geode,PurelyApplied/geode,charliemblack/geode,pdxrunner/geode,deepakddixit/incubator-geode,smgoller/geode,jdeppe-pivotal/geode,charliemblack/geode,pdxrunner/geode,smgoller/geode,prasi-in/geode,jdeppe-pivotal/geode,davinash/geode,deepakddixit/incubator-geode,davinash/geode,PurelyApplied/geode,davinash/geode,masaki-yamakawa/geode,davinash/geode,masaki-yamakawa/geode,pdxrunner/geode,smanvi-pivotal/geode,masaki-yamakawa/geode,davebarnes97/geode,shankarh/geode,smanvi-pivotal/geode,jdeppe-pivotal/geode,davebarnes97/geode,davinash/geode,masaki-yamakawa/geode,prasi-in/geode,jdeppe-pivotal/geode,shankarh/geode,pivotal-amurmann/geode