Fix huggingface.rst documentation

[asmith26]

Update hf:// -> hf://datasets/ (as per #2736 (comment))

[codspeed-hq]

CodSpeed Performance Report

Merging #2746 will degrade performances by 12.4%

_{Comparing asmith26:patch-1 (424ffbd) with main (f21ca7a)}

Summary

❌ 1 regressions
✅ 16 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	asmith26:patch-1	Change
❌	test_explain[1 Small File]	4.8 ms	5.5 ms	-12.4%