Highlight non-commercial license in amazon_reviews_multi dataset card (#4712)

* Update README.md

Highlight that the licence granted by Amazon only covers non-commercial research use.

* Add missing section in dataset card

* Update datasets/amazon_reviews_multi/README.md

* fix toc

* Update README.md

Co-authored-by: Albert Villanova del Moral <8515462+albertvillanova@users.noreply.github.com>
Co-authored-by: Quentin Lhoest <42851186+lhoestq@users.noreply.github.com>

Commit from https://github.com/huggingface/datasets/commit/a2d91b7bd4d9069fce319d8532aa69ab71761d89

README.md

@@ -47,28 +47,36 @@ configs:
 # Dataset Card for The Multilingual Amazon Reviews Corpus
 
 ## Table of Contents
-- [Dataset Description](#dataset-description)
-  - [Dataset Summary](#dataset-summary)
-  - [Supported Tasks and Leaderboards](#supported-tasks-and-leaderboards)
-  - [Languages](#languages)
-- [Dataset Structure](#dataset-structure)
-  - [Data Instances](#data-instances)
-  - [Data Fields](#data-fields)
-  - [Data Splits](#data-splits)
-- [Dataset Creation](#dataset-creation)
-  - [Curation Rationale](#curation-rationale)
-  - [Source Data](#source-data)
-  - [Annotations](#annotations)
-  - [Personal and Sensitive Information](#personal-and-sensitive-information)
-- [Considerations for Using the Data](#considerations-for-using-the-data)
-  - [Social Impact of Dataset](#social-impact-of-dataset)
-  - [Discussion of Biases](#discussion-of-biases)
-  - [Other Known Limitations](#other-known-limitations)
-- [Additional Information](#additional-information)
-  - [Dataset Curators](#dataset-curators)
-  - [Licensing Information](#licensing-information)
-  - [Citation Information](#citation-information)
-  - [Contributions](#contributions)
+- [Dataset Card for amazon_reviews_multi](#dataset-card-for-amazon_reviews_multi)
+  - [Table of Contents](#table-of-contents)
+  - [Dataset Description](#dataset-description)
+    - [Dataset Summary](#dataset-summary)
+    - [Supported Tasks and Leaderboards](#supported-tasks-and-leaderboards)
+    - [Languages](#languages)
+  - [Dataset Structure](#dataset-structure)
+    - [Data Instances](#data-instances)
+      - [plain_text](#plain_text)
+    - [Data Fields](#data-fields)
+      - [plain_text](#plain_text-1)
+    - [Data Splits](#data-splits)
+  - [Dataset Creation](#dataset-creation)
+    - [Curation Rationale](#curation-rationale)
+    - [Source Data](#source-data)
+      - [Initial Data Collection and Normalization](#initial-data-collection-and-normalization)
+      - [Who are the source language producers?](#who-are-the-source-language-producers)
+    - [Annotations](#annotations)
+      - [Annotation process](#annotation-process)
+      - [Who are the annotators?](#who-are-the-annotators)
+    - [Personal and Sensitive Information](#personal-and-sensitive-information)
+  - [Considerations for Using the Data](#considerations-for-using-the-data)
+    - [Social Impact of Dataset](#social-impact-of-dataset)
+    - [Discussion of Biases](#discussion-of-biases)
+    - [Other Known Limitations](#other-known-limitations)
+  - [Additional Information](#additional-information)
+    - [Dataset Curators](#dataset-curators)
+    - [Licensing Information](#licensing-information)
+    - [Citation Information](#citation-information)
+    - [Contributions](#contributions)
 
 ## Dataset Description
 
@@ -84,6 +92,10 @@ For each language, there are 200,000, 5,000 and 5,000 reviews in the training, d
 
 Note that the language of a review does not necessarily match the language of its marketplace (e.g. reviews from amazon.de are primarily written in German, but could also be written in English, etc.). For this reason, we applied a language detection algorithm based on the work in Bojanowski et al. (2017) to determine the language of the review text and we removed reviews that were not written in the expected language.
 
+### Supported Tasks and Leaderboards
+
+[More Information Needed]
+
 ### Languages
 
 The dataset contains reviews in English, Japanese, German, French, Chinese and Spanish.
@@ -192,7 +204,7 @@ Published by Phillip Keung, Yichao Lu, György Szarvas, and Noah A. Smith. Manag
 
 ### Licensing Information
 
-Amazon has licensed this dataset under its own agreement, to be found at the dataset webpage here:
+Amazon has licensed this dataset under its own agreement for non-commercial research usage only. This licence is quite restrictive preventing use anywhere a fee is received including paid for internships etc.  A copy of the agreement can be found at the dataset webpage here:
 https://docs.opendata.aws/amazon-reviews-ml/license.txt
 
 ### Citation Information