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bpo-28681: Clarify multiple function names in the tutorial (GH-21340) (GH-21343) 

* improve control flow docs

* Add also

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
(cherry picked from commit d12af71047)

Co-authored-by: Joannah Nanjekye <33177550+nanjekyejoannah@users.noreply.github.com>

Co-authored-by: Joannah Nanjekye <33177550+nanjekyejoannah@users.noreply.github.com>
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Doc/tutorial/controlflow.rst
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@ -297,11 +297,10 @@ passed using *call by value* (where the *value* is always an object *reference*,
not the value of the object). [#]_ When a function calls another function, a new
local symbol table is created for that call.
A function definition introduces the function name in the current symbol table.
The value of the function name has a type that is recognized by the interpreter
as a user-defined function. This value can be assigned to another name which
can then also be used as a function. This serves as a general renaming
mechanism::
A function definition associates the function name with the function object in
the current symbol table. The interpreter recognizes the object pointed to by
that name as a user-defined function. Other names can also point to that same
function object and can also be used to access the function::
>>> fib
<function fib at 10042ed0>