Broken links in pdf loading documentation

[VyoJ]

Describe the bug

Hi, just a couple of small issues I ran into while reading the docs for loading pdf data:

1. The link for the Create a pdf dataset points to https://huggingface.co/docs/datasets/main/en/pdf_dataset instead of https://huggingface.co/docs/datasets/main/en/document_dataset and hence gives a 404 error.

2. At the top of the page, it's mentioned that to work with pdf datasets we need to have the pdfplumber package installed but the link to its installation guide points to pytorch/vision installation instructions instead of pdfplumber's guide

I love the work on enabling pdf dataset support and these small tweaks would help everyone navigate the docs better. Thanks!

Steps to reproduce the bug

The issue is on the Load Document Data page of the datasets docs.

Expected behavior

1. For solving the first issue, I went through the source .mdx code of the datasets docs and found that the link is pointing to ./pdf_dataset instead of ./document_dataset

2. For the second issue, I went through the source .mdx code of the datasets docs and found that the link is pytorch/vision installation instructions instead of pdfplumber's guide

Just replacing these two links should fix the bugs

Environment info

datasets v3.5.0 (main at the time of writing)