Rename missing John Do

README.md

@@ -186,7 +186,7 @@ Datastore datastore = DatastoreOptions.defaultInstance().service();
 KeyFactory keyFactory = datastore.newKeyFactory().kind("keyKind");
 Key key = keyFactory.newKey("keyName");
 Entity entity = Entity.builder(key)
-    .set("name", "John Do")
+    .set("name", "John Doe")
     .set("age", 30)
     .set("access_time", DateTime.now())
     .build();