Fix section header markup.

pep-0548.rst

@@ -12,14 +12,16 @@ Post-History:
 
 
 Abstract
+========
 
-    This PEP proposes enhancing the 'break' and 'continue' statements
+    This PEP proposes enhancing the ``break`` and ``continue`` statements
     with an optional boolean expression that controls whether or not
     they execute.  This allows the flow of control in loops to be
     expressed more clearly and compactly.
 
 
 Motivation
+==========
 
     Quoting from the rejected :pep:`315`:
 
@@ -48,6 +50,7 @@ Motivation
 
 
 Syntax
+======
 
     The syntax of the break and continue statements are extended
     as follows::
@@ -64,6 +67,7 @@ Syntax
 
 
 Semantics
+=========
 
     A ``break if`` or ``continue if`` is executed if and only if
     ``expression`` evaluates to true.
@@ -77,7 +81,8 @@ Semantics
     does not contain at least one ``break`` or ``return`` statement.
 
 
-Justification
+Justification and Examples
+==========================
 
     The previous "best possible" form::
 
@@ -263,5 +268,6 @@ Justification
 
 
 Copyright
+=========
 
     This document is placed in the public domain.