Update files from the datasets library (from 1.5.0)

Release notes: https://github.com/huggingface/datasets/releases/tag/1.5.0

README.md

@@ -82,8 +82,6 @@ For more details see https://www.clips.uantwerpen.be/conll2003/ner/ and https://
 
 ## Dataset Structure
 
-We show detailed information for up to 5 configurations of the dataset.
-
 ### Data Instances
 
 #### conll2003
@@ -93,18 +91,20 @@ We show detailed information for up to 5 configurations of the dataset.
 - **Total amount of disk used:** 14.41 MB
 
 An example of 'train' looks as follows.
-```
-This example was too long and was cropped:
 
+```
 {
     "chunk_tags": [11, 12, 12, 21, 13, 11, 11, 21, 13, 11, 12, 13, 11, 21, 22, 11, 12, 17, 11, 21, 17, 11, 12, 12, 21, 22, 22, 13, 11, 0],
     "id": "0",
     "ner_tags": [0, 3, 4, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
     "pos_tags": [12, 22, 22, 38, 15, 22, 28, 38, 15, 16, 21, 35, 24, 35, 37, 16, 21, 15, 24, 41, 15, 16, 21, 21, 20, 37, 40, 35, 21, 7],
-    "tokens": "[\"The\", \"European\", \"Commission\", \"said\", \"on\", \"Thursday\", \"it\", \"disagreed\", \"with\", \"German\", \"advice\", \"to\", \"consumers\", \"t..."
+    "tokens": ["The", "European", "Commission", "said", "on", "Thursday", "it", "disagreed", "with", "German", "advice", "to", "consumers", "to", "shun", "British", "lamb", "until", "scientists", "determine", "whether", "mad", "cow", "disease", "can", "be", "transmitted", "to", "sheep", "."]
 }
 ```
 
+The original data files have `-DOCSTART-` lines used to separate documents, but these lines are removed here.
+Indeed `-DOCSTART-` is a special line that acts as a boundary between two different documents, and it is filtered out in this implementation.
+
 ### Data Fields
 
 The data fields are the same among all splits.