Fix code example.

Specify that the error handler is used on all relevant APIs.

pep-0383.txt

@@ -74,7 +74,8 @@ lone half surrogate codes U+DCxx.
 To convert non-decodable bytes, a new error handler "python-escape" is
 introduced, which produces these half surrogates. On encoding, the
 error handler converts the half surrogate back to the corresponding
-byte.
+byte. This error handler used used in any API that receives or produces
+file names, command line arguments, or environment variables.
 
 The error handler interface is extended to allow the encode error
 handler to return byte strings immediately, in addition to returning
@@ -119,7 +120,7 @@ for accepting and returning bytes, would be written as::
       dirname = dirname.decode(fse, "python-escape")
       for fn in os.listdir(dirname):
           # fn is now a str object
-          yield fn.encode(fse, "python-escape"
+          yield fn.encode(fse, "python-escape")
 
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