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[3.13] gh-138005: Document that CSV skipinitialspace=True and delimiter=' ' require quotation for empty fields (GH-138006) (#138799)

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Co-authored-by: Maurycy Pawłowski-Wieroński <5383+maurycy@users.noreply.github.com>
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@ -468,7 +468,8 @@ Dialects support the following attributes:
.. attribute:: Dialect.skipinitialspace
When :const:`True`, spaces immediately following the *delimiter* are ignored.
The default is :const:`False`.
The default is :const:`False`. When combining ``delimiter=' '`` with
``skipinitialspace=True``, unquoted empty fields are not allowed.
.. attribute:: Dialect.strict
@ -637,7 +638,7 @@ done::
.. rubric:: Footnotes
.. [1] If ``newline=''`` is not specified, newlines embedded inside quoted fields
will not be interpreted correctly, and on platforms that use ``\r\n`` linendings
will not be interpreted correctly, and on platforms that use ``\r\n`` line endings
on write an extra ``\r`` will be added. It should always be safe to specify
``newline=''``, since the csv module does its own
(:term:`universal <universal newlines>`) newline handling.