docs: update readme

README.md

@@ -1,6 +1,6 @@
 # volto-block-form
 
-Volto addon which adds a customizable form using a block.
+Volto addon which adds a customizable form using a block.  
 Intended to be used with [collective.volto.formsupport](https://github.com/collective/collective.volto.formsupport).
 
 To be used with mrs-developer, see [Volto docs](https://docs.voltocms.com/customizing/add-ons/) for further usage informations.
@@ -44,7 +44,7 @@ i.e.: aggregated data from user federated authentication:
 
 ![Static fields](./docs/form-static-fields.png)
 
-### Video demos
+## Video demos
 
 - [Form usage](https://youtu.be/v5KtjEACRmI)
 - [Form editing](https://youtu.be/wmTpzYBtNCQ)