Fix AWS doc for macOS 10.11+ users.
Fix AWS doc for macOS 10.11+ users.

Change-Id: I94e7a2f7bc441143640b24aa7984a5600bcd6740
Reviewed-on: https://asterix-gerrit.ics.uci.edu/1671
Sonar-Qube: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@fulliautomatix.ics.uci.edu>
BAD: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@fulliautomatix.ics.uci.edu>
Reviewed-by: Till Westmann <6a75d5097ecd0c0c685f0a2e96aeb5f14c655645@apache.org>

ecarm002/incubator-asterixdb,apache/incubator-asterixdb,heriram/incubator-asterixdb,ty1er/incubator-asterixdb,apache/incubator-asterixdb,ty1er/incubator-asterixdb,apache/incubator-asterixdb,heriram/incubator-asterixdb,ecarm002/incubator-asterixdb,ecarm002/incubator-asterixdb,ty1er/incubator-asterixdb,apache/incubator-asterixdb,ty1er/incubator-asterixdb,heriram/incubator-asterixdb,ecarm002/incubator-asterixdb,ty1er/incubator-asterixdb,heriram/incubator-asterixdb,ecarm002/incubator-asterixdb,heriram/incubator-asterixdb,apache/incubator-asterixdb,apache/incubator-asterixdb,heriram/incubator-asterixdb,ty1er/incubator-asterixdb,heriram/incubator-asterixdb,apache/incubator-asterixdb,ecarm002/incubator-asterixdb,ecarm002/incubator-asterixdb