GEODE-2306: Update the build instructions for GEODE_ROOT.
GEODE-2306: Update the build instructions for GEODE_ROOT.

pivotal-jbarrett/geode-native,PivotalSarge/geode-native,PivotalSarge/geode-native,PivotalSarge/geode-native,mmartell/geode-native,PivotalSarge/geode-native,PivotalSarge/geode-native,pivotal-jbarrett/geode-native,PivotalSarge/geode-native,pivotal-jbarrett/geode-native,mhansonp/geode-native,mmartell/geode-native,mhansonp/geode-native,mmartell/geode-native,mmartell/geode-native,mhansonp/geode-native,mhansonp/geode-native,pivotal-jbarrett/geode-native,mmartell/geode-native,pivotal-jbarrett/geode-native,pivotal-jbarrett/geode-native,mhansonp/geode-native,pivotal-jbarrett/geode-native