Add two missing literal block markers.

pep-3125.txt

@@ -67,7 +67,7 @@ Triple-Quoted Strings
 ---------------------
 
 Open a triple-quoted string; again, people recognize that the string
-needs to finish before the next statement starts.
+needs to finish before the next statement starts. ::
 
     banner_message = """
         Satisfaction Guaranteed,
@@ -112,7 +112,7 @@ Terminal ``\`` within a string
       
 A terminal ``\`` within a single-quoted string, at the end of the
 line.  This is arguably a special case of the terminal ``\``, but it
-is a special case that may be worth keeping.
+is a special case that may be worth keeping. ::
 
     >>> "abd\
      def"