Update README.md

README.md

@@ -16,7 +16,7 @@ This dataset is a supplement to the github-project published in the https://gith
 In these files there are following fields:
 - **sample** is a sample type (train, val, test);
 - **H0_H1** is a true hypothesis (H0 or H1);
-- **Hi** is an alternative hypothesis (H01-H09, H11-H19 or H21-H29);
+- **Hi** is an alternative hypothesis (H01-H09, H11-H19, or H21-H29);
 - **n1** is the size of sample 1;
 - **n2** is the size of sample 2;
 - **real_perc1** is an actual censoring rate of sample 1;