Doc: use "unnumbered" footnotes (GH-98954)

Use unnumbered footnote in this file to avoid reseting the footnotes numbering.

Example: when building the tutorial into a PDF and using `latex_show_urls = "footnotes"`; this footnote become the number 8. However, without this change, the footnote shows the number 1.
(cherry picked from commit f042646595)

Co-authored-by: Manuel Kaufmann <humitos@gmail.com>
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Miss Islington (bot) 2022-11-01 06:35:34 -07:00 committed by GitHub
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@ -122,7 +122,7 @@ An example that uses most of the list methods::
You might have noticed that methods like ``insert``, ``remove`` or ``sort`` that
only modify the list have no return value printed -- they return the default
``None``. [1]_ This is a design principle for all mutable data structures in
``None``. [#]_ This is a design principle for all mutable data structures in
Python.
Another thing you might notice is that not all data can be sorted or
@ -731,5 +731,5 @@ interpreter will raise a :exc:`TypeError` exception.
.. rubric:: Footnotes
.. [1] Other languages may return the mutated object, which allows method
.. [#] Other languages may return the mutated object, which allows method
chaining, such as ``d->insert("a")->remove("b")->sort();``.