Remove unneeded 'ports' entries from WP and Django fig.ymls in docs

docs/django.md

@@ -28,8 +28,6 @@ Simple enough. Finally, this is all tied together with a file called `fig.yml`.
 
     db:
       image: orchardup/postgresql
-      ports:
-        - "5432"
     web:
       build: .
       command: python manage.py runserver 0.0.0.0:8000

docs/wordpress.md

@@ -33,8 +33,6 @@ web:
     - .:/code
 db:
   image: orchardup/mysql
-  ports:
-    - "3306:3306"
   environment:
     MYSQL_DATABASE: wordpress
 ```