Dataset card polished

README.md

@@ -963,11 +963,15 @@ language:
 - zu
 ---
 
-For a detailed description of this dataset please refer to https://hplt-project.org/datasets/v2.0
+This is a large-scale collection of web-crawled documents in 191 world languages, produced by the [HPLT project](https://hplt-project.org/). 
+The source of the data is mostly [Internet Archive](https://archive.org/) with some additions from [Common Crawl](https://commoncrawl.org/).
+
+For a detailed description of the dataset, please refer to https://hplt-project.org/datasets/v2.0
 
 **The Cleaned variant of HPLT Datasets v2.0**
 
-This is the ```cleaned``` variant of the HPLT Datasets v2.0 converted to the Parquet format semi-automatically when being uploaded here. For the original jsonl distribution (which takes ~4x fewer disk space) and a larger non-cleaned version please refer to https://hplt-project.org/datasets/v2.0.
+This is the ```cleaned``` variant of the HPLT Datasets v2.0 converted to the Parquet format semi-automatically when being uploaded here. 
+The original JSONL files (which take ~4x fewer disk space than this HF version) and the larger non-cleaned version can be found at https://hplt-project.org/datasets/v2.0.
 
 ***Languages***