Update README.md

README.md

@@ -24,7 +24,7 @@ The final dataset comprised 335,516 images from 96,385 patients and was split in
 
 Validation performance as follows:
 ```
-Segmentation (Dice similary coefficient):
+Segmentation (Dice similarity coefficient):
   Right Lung: 0.853
    Left Lung: 0.844
        Heart: 0.839