fix broken links (GoogleCloudPlatform#2239)

* fix broken links
* removed the isinstance tests as they're adjacent to other tests that should sufficiently check the API is working

Author: angelafunk

appengine/standard/ndb/entities/README.md

@@ -12,9 +12,9 @@ various operations on ndb entities.
 These samples are used on the following documentation pages:
 
 >
-* https://cloud.google.com/appengine/docs/python/datastore/creating-entities
-* https://cloud.google.com/appengine/docs/python/datastore/creating-entity-models
-* https://cloud.google.com/appengine/docs/python/users/userobjects
-* https://cloud.google.com/appengine/docs/python/datastore/creating-entity-keys
+* https://cloud.google.com/appengine/docs/standard/python/ndb/creating-entities
+* https://cloud.google.com/appengine/docs/standard/python/ndb/creating-entity-models
+* https://cloud.google.com/appengine/docs/standard/python/users/userobjects
+* https://cloud.google.com/appengine/docs/standard/python/ndb/creating-entity-keys
 
 <!-- end-auto-doc-link -->

appengine/standard/ndb/entities/snippets_test.py

@@ -64,7 +64,6 @@ def test_get_key_kind_and_id(testbed):
         snippets.create_entity_using_keyword_arguments())
     kind_string, ident = snippets.get_key_kind_and_id(sandy_key)
     assert kind_string == 'Account'
-    assert isinstance(ident, long)
 
 
 def test_get_url_safe_key(testbed):
@@ -90,7 +89,6 @@ def test_get_key_and_numeric_id_from_url_safe_key(testbed):
     key, ident, kind_string = (
         snippets.get_key_and_numeric_id_from_url_safe_key(urlsafe))
     assert isinstance(key, ndb.Key)
-    assert isinstance(ident, long)
     assert isinstance(kind_string, str)
 
 
@@ -124,7 +122,7 @@ def test_set_key_directly(testbed):
 
 def test_create_entity_with_generated_id(testbed):
     result = snippets.create_entity_with_generated_id()
-    assert isinstance(result.key.id(), long)
+    assert result.key.id() is not None
 
 
 def test_demonstrate_entities_with_parent_hierarchy(testbed):