fix example

map.py

@@ -52,15 +52,11 @@ Returns:
 Examples:
    
     >>> my_new_module = evaluate.load("map")
-    >>> results = my_new_module.compute(
-        references=[
-            ["d_1", "d_2"],
-            ["d_2", "d_3", "d_5"]
-        ]
-    predictions={ 
-        "q_1": { "d_1": 0.9, "d_2": 0.8, },
-        "q_2": { "d_2": 0.9, "d_1": 0.8, "d_5": 0.7, "d_3": 0.3} }
-)
+    >>> references= [json.dumps({"q_1":{"d_1":1, "d_2":2} }), 
+             json.dumps({"q_2":{"d_2":1, "d_3":2, "d_5":3}})] 
+    >>> predictions = [json.dumps({"q_1": { "d_1": 0.9, "d_2": 0.8}}),
+         json.dumps({"q_2": {"d_2": 0.9, "d_1": 0.8, "d_5": 0.7, "d_3": 0.3}})]
+    >>> results = my_new_module.compute(references=references, predictions=predictions)
     >>> print(results)
     {'map': 0.902777}
 """