[docs] [issue42360] In the namedtuple documentation, mention that typename should match the variable name for the class to be pickle-able

Raymond Hettinger added the comment: I'll add a brief note to the named tuple docs. FWIW, this is a special case of the more general issue that pickling errors tend to be inscrutable. ---------- assignee: docs@python -> rhettinger nosy: +rhettinger _______________________________________ Python tracker https://bugs.python.org/issue42360 _______________________________________