Fix formatting.

pep-0461.txt

@@ -59,7 +59,7 @@ Example:
     >>> b'%c' % b'a'
     b'a'
 
-``%s`` is restricted in what it will accept::
+``%s`` is restricted in what it will accept:
 
 - input type supports ``Py_buffer`` [4]_?
   use it to collect the necessary bytes
@@ -67,7 +67,7 @@ Example:
 - input type is something else?
   use its ``__bytes__`` method [5]_ ; if there isn't one, raise a ``TypeError``
 
-Examples:
+Examples::
 
     >>> b'%s' % b'abc'
     b'abc'
@@ -83,7 +83,6 @@ Examples:
     TypeError: 'hello world' has no __bytes__ method, perhaps you need to encode it?
 
 .. note::
-
    Because the ``str`` type does not have a ``__bytes__`` method, attempts to
    directly use ``'a string'`` as a bytes interpolation value will raise an
    exception.  To use ``'string'`` values, they must be encoded or otherwise