comments: expand port and pass comments

Author: jeremydouglass

docker-cloud.yml

@@ -7,7 +7,7 @@ services:
 
   web:
     image: 'nginx'
-    ## instead of an exposed port use FORWARD_PORT below
+    ## instead of an exposed port, use FORWARD_PORT in auth, below
     # ports:
     #   - '80:80'
     volumes:
@@ -22,4 +22,5 @@ services:
       - FORWARD_HOST=web
       - FORWARD_PORT=80
       ## escape $ with $$ in Docker yml due to variable expansion
+      ## example user/pass generated with htpasswd is foo:bar
       - HTPASSWD=foo:$$apr1$$odHl5EJN$$KbxMfo86Qdve2FH4owePn.