Protected template properties seems not to be the norme in angular.

Hello,

I was reviewing the TypeScript style guide and noticed that it recommends using `protected` for template properties:
https://google.github.io/styleguide/tsguide.html#properties-used-outside-of-class-lexical-scope

However, in practice, I rarely see this used in the documentations. Not in the Angular documentation, nor in Angular Material documentation.

Given that this rule doesn't seem to be followed in most real-world Angular codebases, would it make sense to consider removing this recommendation or just say "prefer `public`" instead? That would likely be the least disruptive change with minimal impact on existing projects.

Thank you for your feedback!