Update Walmart-Amazon.py

Walmart-Amazon.py

@@ -84,6 +84,6 @@ class WalmartAmazon(datasets.GeneratorBasedBuilder):
                     "title": row["title"],
                     "category": row["category"],
                     "brand": row["brand"],
-					"modelno: row["modelno"],
+					"modelno": row["modelno"],
 					"price": row["price"],
                 }