Fixed typo in README

typo in readme - unable to download dataset using `load_dataset('RadGenome/RadGenome-ChestCT', 'case-level vqa')`

README.md

@@ -72,7 +72,7 @@ configs:
   - split: train
     path: "dataset/radgenome_files/train_case_disorders.csv"
   - split: validation
-    path: "dataset/radgenome_files/calidation_case_disorders.csv"    
+    path: "dataset/radgenome_files/validation_case_disorders.csv"    
 ---