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bpo-34804: [doc] Rephrase section on side effects in functional.rst for clarity (GH-27989) (GH-28762)

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Co-authored-by: Łukasz Langa <lukasz@langa.pl>
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Co-authored-by: DonnaDia <37962843+DonnaDia@users.noreply.github.com>
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Doc/howto/functional.rst
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@ -65,11 +65,10 @@ output must only depend on its input.
Some languages are very strict about purity and don't even have assignment
statements such as ``a=3`` or ``c = a + b``, but it's difficult to avoid all
side effects. Printing to the screen or writing to a disk file are side
effects, for example. For example, in Python a call to the :func:`print` or
:func:`time.sleep` function both return no useful value; they're only called for
their side effects of sending some text to the screen or pausing execution for a
second.
side effects, such as printing to the screen or writing to a disk file. Another
example is a call to the :func:`print` or :func:`time.sleep` function, neither
of which returns a useful value. Both are called only for their side effects
of sending some text to the screen or pausing execution for a second.
Python programs written in functional style usually won't go to the extreme of
avoiding all I/O or all assignments; instead, they'll provide a