Fix healthcheck doc for PG #225

Job	Run time
test	4m 31s
build-and-push-base-no-s6	5m 51s
build-and-push-base	6m 9s
build-and-push-pg	47s
build-and-push-manager-no-s6	4m 53s
build-and-push-cron-task-no-s6	2m 10s
build-and-push-portal-hiperf-no-s6	4m 52s
build-and-push-cron-no-s6	1m 56s
build-and-push-ssoaas-fastcgi-server-no-s6	2m 23s
build-and-push-sessions-backup-no-s6	48s
build-and-push-portal-no-s6	5m 22s
build-and-push-cron	2m 21s
build-and-push-cron-task	1m 41s
build-and-push-manager	4m 37s
build-and-push-portal	5m 18s
build-and-push-portal-hiperf	4m 55s
build-and-push-sessions-backup	40s
build-and-push-ssoaas-fastcgi-server	2m 25s
build-and-push-full-no-s6	3m 17s
build-and-push-full	3m 34s
build-and-push-dev	1m 57s
	1h 10m 27s

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