Use comma after etc.

Use comma before etc.

Author: kaiquekandykoga

guides/source/active_record_multiple_databases.md

@@ -203,7 +203,7 @@ database you can run `bin/rails db:create:animals`.
 ## Connecting to Databases without Managing Schema and Migrations
 
 If you would like to connect to an external database without any database
-management tasks such as schema management, migrations, seeds, etc. you can set
+management tasks such as schema management, migrations, seeds, etc., you can set
 the per database config option `database_tasks: false`. By default it is
 set to true.