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MINOR: [Doc] Update Parquet documentation website links (#35578)

### Rationale for this change

While reviewing the Arrow docs on Parquet, I noticed two links to https://parquet.apache.org/documentation/latest/ which 404 for me. As far as I can tell, the docs site was redone and moved to https://parquet.apache.org/docs some time in 2022.

### Are these changes tested?

I didn't go so far as to find the associated Jira issue for the docs website refactor so I'd appreciate if someone more familiar with the project could double-check if the old URL is indeed permanently dead.

Authored-by: Bryce Mecum <petridish@gmail.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>