docs linting and improving first example

docs/example1.py

@@ -1,14 +1,16 @@
 from datetime import datetime
+from typing import List
 from pydantic import BaseModel
 
 class UserModel(BaseModel):
     id: int = ...
     name = 'John Doe'
     signup_ts: datetime = None
+    friends: List[int] = []
 
-external_data = {'id': '123', 'signup_ts': '2017-06-01 12:22'}
+external_data = {'id': '123', 'signup_ts': '2017-06-01 12:22', 'friends': [1, '2', b'3']}
 user = UserModel(**external_data)
 print(user)
-# > UserModel id=123 name='John Doe' signup_ts=datetime.datetime(2017, 6, 1, 12, 22)
+# > UserModel id=123 name='John Doe' signup_ts=datetime.datetime(2017, 6, 1, 12, 22) friends=[1, 2, 3]
 print(user.id)
 # > 123