Clarify comment for release step

Signed-off-by: Anna Rift <[email protected]>

util/cron/test-docker.bash

@@ -6,6 +6,8 @@
 #
 # Assumes Docker is already running on the system, logged into an account with
 # appropriate permissions to push the images.
+#
+
 
 CWD=$(cd $(dirname $0) ; pwd)
 source $CWD/common.bash
@@ -117,8 +119,8 @@ update_all_images() {
 # Build and push nightly images
 update_all_images
 
-# Build and push release images after ALL nightly builds have succeeded, if
-# release tag was specified.
+# Build and push release-tagged images, if RELEASE_VERSION was specified.
+# Runs after all nightly images, to abort release if any fail.
 if [ -n "$RELEASE_VERSION" ]
 then
   update_all_images "$RELEASE_VERSION"