[#6465] fix newline position

cookbook/security/custom_provider.rst

@@ -10,10 +10,9 @@ the configured user provider to return a user object for a given username.
 Symfony then checks whether the password of this user is correct and generates
 a security token so the user stays authenticated during the current session.
 Out of the box, Symfony has four user providers: ``in_memory``, ``entity``, 
-``ldap`` and ``chain``.
-In this entry you'll see how you can create your own user provider, which
-could be useful if your users are accessed via a custom database, a file,
-or - as shown in this example - a web service.
+``ldap`` and ``chain``. In this entry you'll see how you can create your
+own user provider, which could be useful if your users are accessed via a
+custom database, a file, or - as shown in this example - a web service.
 
 Create a User Class
 -------------------