fix documentation issue

pandas/io/json/normalize.py

@@ -2,7 +2,7 @@
 # JSON normalization routines
 
 from collections import defaultdict
-from typing import Union, List, Dict, Any
+from typing import Union, List, Dict, Any, DefaultDict
 import copy
 
 import numpy as np
@@ -155,7 +155,6 @@ def json_normalize(data: List[Dict[Any, Any]],
  Returns
  -------
  frame : DataFrame
-
  Normalize semi-structured JSON data into a flat table.
 
  Examples
@@ -211,7 +210,7 @@ def json_normalize(data: List[Dict[Any, Any]],
  ... 'counties': [{'name': 'Summit', 'population': 1234},
  ... {'name': 'Cuyahoga', 'population': 1337}]}]
  >>> result = json_normalize(data, 'counties', ['state', 'shortname',
- ... ['info', 'governor']])
+ ...  ['info', 'governor']])
  >>> result
  name population state shortname info.governor
  0 Dade 12345 Florida FL Rick Scott
@@ -225,6 +224,8 @@ def json_normalize(data: List[Dict[Any, Any]],
  Prefix.0
  0 1
  1 2
+
+ Returns normalized data with columns prefixed with the given string.
  """
  def _pull_field(js, spec):
  result = js