Update comment to include S3 installation source

Author: interatom

defaults/main.yml

@@ -7,7 +7,8 @@ aem_version_short: "{{ aem_version | regex_replace('(\\d+\\.\\d+).*', '\\1') }}"
 aem_quickstart_name: "AEM_{{ aem_version_short }}_Quickstart.jar"
 # SHA1 hash of the quickstart.jar
 # aem_quickstart_sha1: 663360C9D50A09A0BE685053DEA10D03515C2009
-aem_install_source: file # can be file, package, url or nexus
+# Installation source: file, package, url, s3 or nexus
+aem_install_source: file
 aem_download_path: /tmp
 aem_remove_download: false