Update auth_integration.md (#76)

`self` should be `request` to compatible with `django-ninja` practise.

Author: Svtter

docs/auth_integration.md

@@ -24,7 +24,7 @@ from ninja_jwt.authentication import JWTAuth
 router = router('')
 
 @router.get('/some-endpoint', auth=JWTAuth())
-def some_endpoint(self):
+def some_endpoint(request):
     ...
 ```
 
@@ -71,4 +71,4 @@ class MyController:
 N:B `some_endpoint` must be asynchronous. Any endpoint function marked with `AsyncJWTAuth` must be asynchronous. 
 
 !!! warning
-    Asynchronous feature is only available for django version > 3.0
+    Asynchronous feature is only available for django version > 3.0