Correct description of HTTP status code 308. (GH-15098)

Permanent redirect was explained as a temporary redirect.
(cherry picked from commit 5c72bad)

Co-authored-by: Florian Wendelborn <1133858+FlorianWendelborn@users.noreply.github.com>

Lib/http/__init__.py

@@ -59,7 +59,7 @@ def __new__(cls, value, phrase, description=''):
     TEMPORARY_REDIRECT = (307, 'Temporary Redirect',
         'Object moved temporarily -- see URI list')
     PERMANENT_REDIRECT = (308, 'Permanent Redirect',
-        'Object moved temporarily -- see URI list')
+        'Object moved permanently -- see URI list')
 
     # client error
     BAD_REQUEST = (400, 'Bad Request',