Update README.md

README.md

@@ -83,10 +83,10 @@ B2W-Reviews01 is an open corpus of product reviews. It contains more than 130k e
 * **site_category_lv2**: the second level category for the product on the site where the review is being submitted.
 * **review_title**: the title of the review.
 * **overall_rating**: the overall star rating given by the reviewer on a scale of 1 to 5.
-* **recommend_to_a_friend**: whether or not the reviewer would recommend the product to a friend (Yes/No/nan).
+* **recommend_to_a_friend**: whether or not the reviewer would recommend the product to a friend (Yes/No).
 * **review_text**: the full text of the review.
 * **reviewer_birth_year**: the birth year of the reviewer.
-* **reviewer_gender**: the gender of the reviewer (F/M/nan).
+* **reviewer_gender**: the gender of the reviewer (F/M).
 * **reviewer_state**: the Brazilian state of the reviewer (e.g. RJ).
 
 ### Data Splits