[DOCS] Fix typo in write_parquet's parameters

[desmondcheongzx]

Should be write_mode not mode.

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #3252 will degrade performances by 50.76%

_{Comparing desmondcheongzx:fix-typo-in-write-parquet-docs (6942d95) with main (54e58df)}

Summary

❌ 1 regressions ✅ 16 untouched benchmarks

:warning: Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	desmondcheongzx:fix-typo-in-write-parquet-docs	Change
❌	test_show[100 Small Files]	33.1 ms	67.2 ms	-50.76%