Fix database URI formatting in models.md (#1746)

Correct formatting of the database URI in the configuration example.

Author: RenameMe1

docs-site/content/docs/the-app/models.md

@@ -27,7 +27,7 @@ To configure `postgres` instead of `sqlite`, go into your `config/development.ya
 
 ```yaml
 database:
-  uri: "{{ get_env(name="DATABASE_URL", default="postgres://loco:loco@localhost:5432/myapp_development") }"
+  uri: "{{ get_env(name="DATABASE_URL", default="postgres://loco:loco@localhost:5432/myapp_development") }}"
 ```
 
 <div class="infobox">