MINOR: [Python] Fix Partitioning parse() docstring example (#13269)
MINOR: [Python] Fix Partitioning parse() docstring example (#13269)

Authored-by: Joris Van den Bossche <36c737f86d71d8ee1ddeb1e5c83102ee5de8f97c@gmail.com>
Signed-off-by: Joris Van den Bossche <36c737f86d71d8ee1ddeb1e5c83102ee5de8f97c@gmail.com>
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