Update README.md

README.md

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 Original data from: https://github.com/armancohan/long-summarization
 
-The first 3000 rows of the original dataset were processed and filtered as follows. This resulted in 1733 filtered rows.
+The first 3000 rows of the test split of the original dataset were processed and filtered as follows. This resulted in 1733 filtered rows.
 
 * In the original dataset, some sentences appear several times in the same article, even if they're only contained once in the original research paper.
 For this reason, all dataset rows where the same sentence appeared more than once where removed.