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Joris Van den Bossche authored and GitHub committed 2f9f892a007
GH-39196: [Python][Docs] Document the Arrow PyCapsule protocol in the 'extending pyarrow' section of the Python docs (#39199) ### Rationale for this change While the Arrow PyCapsule protocol itself is defined in the specification part of the docs, this PR adds a section about it in the Python user guide as well (referring to the specification for most details), where users might typically look for Python specific docs. * Closes: #39196 Lead-authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com> Co-authored-by: Antoine Pitrou <pitrou@free.fr> Signed-off-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>