Update dataset description.

index.html

@@ -193,7 +193,7 @@ <h2 class="title is-3">Dataset</h2>
             Each tracking sequence is 10 to 20 seconds in length.  The dataset
             contains of a total of 30 sequences of which 17 are for training
             and the remaining 13 are for testing. Among the training sequences,
-            two of them consist of roughly 5,000 annotated images, which can be
+            2 of them consist of roughly 5,000 annotated images, which can be
             used to train a cotton boll detection model.  The video sequences
             were captured at 4K resolution and at distinct frame rates (e.g.,
             10, 15, 30).  There are typically 2 to 10 cotton bolls per cluster.