Minor tweaks

Author: javiereguiluz

components/security/authorization.rst

@@ -167,8 +167,10 @@ role::
 Roles
 -----
 
-Roles are strings that give expression to a certain right the user has. The only
-requirement is that they must start with the ``ROLE_`` prefix.
+Roles are strings that give expression to a certain right the user has (e.g.
+*"edit a blog post"*, *"create an invoice"*). You can freely choose those
+strings. The only requirement is that they must start with the ``ROLE_`` prefix
+(e.g. ``ROLE_POST_EDIT``, ``ROLE_INVOICE_CREATE``).
 
 Using the Decision Manager
 --------------------------

security/impersonating_user.rst

@@ -98,7 +98,7 @@ to show a link to exit impersonation:
 Finding the Original User
 -------------------------
 
-versionadded:: 4.3
+.. versionadded:: 4.3
 
     The ``SwitchUserToken`` class was introduced in Symfony 4.3.