Update datasets task tags to align tags with models (#4067)

* update tasks list

* update tags in dataset cards

* more cards updates

* update dataset tags parser

* fix multi-choice-qa

* style

* small improvements in some dataset cards

* allow certain tag fields to be empty

* update vision datasets tags

* use multi-class-image-classification and remove other tags

Commit from https://github.com/huggingface/datasets/commit/edb4411d4e884690b8b328dba4360dbda6b3cbc8

README.md

@@ -17,9 +17,9 @@ size_categories:
 source_datasets:
 - extended|other-web-nlg
 task_categories:
-- conditional-text-generation
+- tabular-to-text
 task_ids:
-- other-structured-to-text
+- rdf-to-text
 paperswithcode_id: null
 pretty_name: Enriched WebNLG
 ---
@@ -64,7 +64,7 @@ DBpedia triples shown in (a), the aim is to generate a text such as (b). It is a
 
 ### Supported Tasks and Leaderboards
 
-The dataset supports a `other-structured-to-text` task which requires a model takes a set of RDF (Resource Description
+The dataset supports a `other-rdf-to-text` task which requires a model takes a set of RDF (Resource Description
 Format) triples from a database (DBpedia) of the form (subject, property, object) as input and write out a natural
 language sentence expressing the information contained in the triples.