Update README.md

README.md

@@ -16,7 +16,7 @@ size_categories:
 BasqueSumm was automatically compiled from www.berria.eus 
 using [trafilatura](https://trafilatura.readthedocs.io) to extract the texts.
 
-Each line is a JSON object with the following keys, value pairs:
+Each instance has the following key-value pairs:
 
 * `"date"` (str): When the article was published, formatted as `"yyyy-mm-dd"`.
 * `"url"` (str): The URL of the original publication.