Revert last change, the string is consistent w/ total_ordering

This reverts commit 2f395f1.

src/attr/_cmp.py

@@ -128,7 +128,7 @@ def method(self, other):
         return result
 
     method.__name__ = "__%s__" % (name,)
-    method.__doc__ = "Return a %s b. Automatically created by attrs." % (
+    method.__doc__ = "Return a %s b.  Computed by attrs." % (
         _operation_names[name],
     )