Update handling-relations-to-collections.md

Author: dunglas

admin/handling-relations-to-collections.md

@@ -73,8 +73,7 @@ The admin handles this `to-many` relation automatically!
 
 But we can go further:
 
-
-## Customizing a property
+## Customizing a Property
 
 Let's customize the components used for the `authors` property, to display them by their 'name' instead 'id' (the default behavior).
 
@@ -123,7 +122,6 @@ export default class extends Component {
 }
 ```
 
-
 ## Using an Autocomplete Input for Relations
 
 We'll make one last improvement to our admin: transforming the relation selector we just created to use autocompletion.