Update outdated information in the documentation

Much of the Routing information suggests to use forRoot() or forChild(). However, in Singleton services you write:

since Angular 6.0, the best practice for providing services is with the @Injectable() providedIn property as it makes your services tree-shakable.

The contradiction also applies to other Angular features, e.g. entryComponents.

I propose to revise the documentation to not contradict itself and to provide updated information in all pages. Or, alternatively, to specify, e.g., why the Router is an exception to the rule.

[angular-robot[bot]]

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[aikithoughts]

@SetTrend I think you’re right in this case–I’ll talk to our infrastructure folks to see if we can adjust this.

I do have this issue on our list to review and prioritize.