Outdated `Internal yet public` and `public for the template` sections

[chernodub]

Hi @molily, firstly, huge thanks for your work, the book is fantastic!

As I was re-reading the article about components testing, I noticed that a couple of topics (Internal yet public and public for the template) are a bit outdated. Angular 14 introduced support of protected component members on template. Probably it would be a good idea to leave a note about this feature in the book.