Added missing keywords to the yaml

... and moved some documentatory comments to the beginning of the file.

initializers/users.yml

@@ -1,10 +1,21 @@
+## To list all permissions, run:
+## 
+## docker-compose run --rm --entrypoint /bin/bash netbox
+## $ ./manage.py migrate
+## $ ./manage.py shell
+## > from django.contrib.auth.models import Permission
+## > print('\n'.join([p.codename for p in Permission.objects.all()]))
+##
+## Permission lists support wildcards. See the examples below.
+##
+## Examples:
+
 # technical_user:
 #   api_token: 0123456789technicaluser789abcdef01234567 # must be looooong!
 # reader:
 #   password: reader
 # writer:
 #   password: writer
-## specify explicit permission codenames or include wildcard to match multiple permissions
 #   permissions:
 #   - delete_device
 #   - delete_virtualmachine