Fix spell mistake

README.md

@@ -36,7 +36,7 @@ For example:
 ```shell
     $ rails g shotengai:models --product MyProduct --order MyOrder
 ```
-    This will create two model file:
+    This will create several model files:
         create  app/models/my_product.rb
         create  app/models/my_product_series.rb
         create  app/models/my_product_snapshot.rb

lib/generators/shotengai/models_generator.rb

@@ -11,7 +11,7 @@ module Shotengai
         Use --catalog to custom your own catalog class
 
         For example:
-          rails g shotengai:models --product MyProduct --order MyOrder
+          rails g shotengai:models --product MyProduct --order MyOrder --catalog Catalog
         This will create some model file:
               create  app/models/my_product.rb
               create  app/models/my_product_series.rb

lib/generators/templates/models/product.rb

 class <%= @product_name %> < Shotengai::Product
-  join_catalog_system 'Cataglog'
+  join_catalog_system 'Catalog'
 end