Adjust a comment heading slightly for Calibre (#2278)

Author: CLHatch

compose/.apps/calibre/.env.app.calibre

@@ -8,6 +8,7 @@ CLI_ARGS=''
 ## Selkies Settings
 ##
 ## https://github.com/linuxserver/docker-baseimage-selkies/blob/master/README.md#options
+##
 
 #CUSTOM_PORT='8080'                             # Internal port the container listens on for http
 #CUSTOM_HTTPS_PORT='8181'                       # Internal port the container listens on for https