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GH-41748: [Python][Parquet] Update BYTE_STREAM_SPLIT description in write_table() docstring (#41759)

### Rationale for this change

In PR #40094 (issue GH-39978), we forgot to update the `write_table` docstring with an accurate description of the supported data types for BYTE_STREAM_SPLIT.

### Are these changes tested?

No (only a doc change).

### Are there any user-facing changes?

No.
* GitHub Issue: #41748

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>