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Document that return-less user-defined functions return None (#126769) 

Co-authored-by: Andrew Svetlov <andrew.svetlov@gmail.com>
Co-authored-by: Carol Willing <carolcode@willingconsulting.com>
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Doc/reference/expressions.rst
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@ -1156,7 +1156,8 @@ a user-defined function:
first thing the code block will do is bind the formal parameters to the
arguments; this is described in section :ref:`function`. When the code block
executes a :keyword:`return` statement, this specifies the return value of the
function call.
function call. If execution reaches the end of the code block without
executing a :keyword:`return` statement, the return value is ``None``.
a built-in function or method:
.. index::