Make autodoc to generate docs for retry_always()/retry_never()

tenacity/retry.py

@@ -38,22 +38,20 @@ def __or__(self, other):
 
 
 class _retry_never(retry_base):
-    """Retry strategy that never rejects any result."""
-
     def __call__(self, retry_state):
         return False
 
 
+#: Retry strategy that never rejects any result.
 retry_never = _retry_never()
 
 
 class _retry_always(retry_base):
-    """Retry strategy that always rejects any result."""
-
     def __call__(self, retry_state):
         return True
 
 
+#: Retry strategy that always rejects any result.
 retry_always = _retry_always()