Bug in the docs

[M1ha-Shvn]

https://github.com/JBKahn/django-sharding/blob/master/README.md
contains error in "Create Your First Sharded Model" section.
@model_config(sharded=True) has no parameter sharded in latest version of library.

[M1ha-Shvn]

And another one:
http://josephkahn.io/django-sharding/docs/installation/Settings.html
Additional Settings
ReadOnlyFromPrimaryDatabases is really called PrimaryOnlyRoutingStrategy

[M1ha-Shvn]

http://josephkahn.io/django-sharding/docs/installation/Settings.html
DJANGO_FRAGMENTS_SHARD_SETTINGS is DJANGO_SHARDING_SETTINGS parameter in django.conf
See: https://github.com/JBKahn/django-sharding/blob/master/django_sharding/apps.py#L15

[M1ha-Shvn]

http://josephkahn.io/django-sharding/docs/usage/DataMigrations.html

def do_the_stuff(apps, schema_editor):
  User = apps.get_model("auth", "User")
  current_database = schema_editor.connection.alias

  if is_model_class_on_database(model=User, database=database):
      User.objects.using(database).update(password="*******")

Variable is called current_database at first, but used as database