Update element_count.py

element_count.py

@@ -41,7 +41,7 @@ Returns:
     element_count: number of elements in dataset,
 Examples:
     >>> measure = evaluate.load("lvwerra/element_count")
-    >>> measure.compute(["a", "b", "c")
+    >>> measure.compute(["a", "b", "c"])
     {"element_count": 3}
 """