Issue 18301:  The classmethod decorator didn't fit well with the rough-equivalent example code.
diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst
index 0ee93ed..9b64c7d 100644
--- a/Doc/library/itertools.rst
+++ b/Doc/library/itertools.rst
@@ -156,9 +156,8 @@
 .. classmethod:: chain.from_iterable(iterable)
 
    Alternate constructor for :func:`chain`.  Gets chained inputs from a
-   single iterable argument that is evaluated lazily.  Equivalent to::
+   single iterable argument that is evaluated lazily.  Roughly equivalent to::
 
-      @classmethod
       def from_iterable(iterables):
           # chain.from_iterable(['ABC', 'DEF']) --> A B C D E F
           for it in iterables: