Update security.rst

Author: ifdattic

book/security.rst

@@ -14,11 +14,11 @@ is both flexible and (hopefully) fun to work with.
 Since there's a lot to talk about, this chapter is organized into a few big
 sections:
 
-1) Initial ``security.yml`` setup (*authentication*);
+1. Initial ``security.yml`` setup (*authentication*);
 
-2) Denying access to your app (*authorization*);
+2. Denying access to your app (*authorization*);
 
-3) Fetching the current User object.
+3. Fetching the current User object.
 
 These are followed by a number of small (but still captivating) sections,
 like :ref:`logging out <book-security-logging-out>` and :ref:`encoding user passwords <security-encoding-password>`.