Suggestion for Chapter 15

Just a suggestion for Chapter 15

Reading assignment for Nov. 10: chapter 9 & 15
Reading assignment for Nov. 17: chapter 10 & 11

Since I haven’t read 11 before reading 15, it would be nice for the Note to refer to Chapter 11
which describes how to get ApiKey and ApiId by Signing up with the recipe API.

Note: If you use the starter app, don’t forget to add your apiKey and apiId in network/recipe_service.dart.