gh-87691: add an absolute path pathlib example in / operator docs (GH-100737)

The behaviour is fully explained a couple paragraphs above, but it may be useful to have a brief example to cover the behaviour.
(cherry picked from commit 1ae619c911)

Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>
Automerge-Triggered-By: GH:hauntsaninja
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Miss Islington (bot) 2023-01-05 15:04:57 -08:00 committed by GitHub
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@ -212,7 +212,10 @@ Paths of a different flavour compare unequal and cannot be ordered::
Operators
^^^^^^^^^
The slash operator helps create child paths, similarly to :func:`os.path.join`::
The slash operator helps create child paths, mimicking the behaviour of
:func:`os.path.join`. For instance, when several absolute paths are given, the
last is taken as an anchor; for a Windows path, changing the local root doesn't
discard the previous drive setting::
>>> p = PurePath('/etc')
>>> p
@ -222,6 +225,10 @@ The slash operator helps create child paths, similarly to :func:`os.path.join`::
>>> q = PurePath('bin')
>>> '/usr' / q
PurePosixPath('/usr/bin')
>>> p / '/an_absolute_path'
PurePosixPath('/an_absolute_path')
>>> PureWindowsPath('c:/Windows', '/Program Files')
PureWindowsPath('c:/Program Files')
A path object can be used anywhere an object implementing :class:`os.PathLike`
is accepted::