updated d4mac, d4win clarification per Charles's comments copyedits and streamline wording fixed links streamlined, fixed line wraps incorporated more review comments Signed-off-by: Victoria Bialas <victoria.bialas@docker.com> incorporated more review comments incorporated more edit comments and fixed line wraps Signed-off-by: Victoria Bialas <victoria.bialas@docker.com> Upstream-commit: 566c2c9d3236b0adffaca425db5d4bac66ba8c1c Component: engine