AIO: UI improvements for deprecated APIs

[AndrewKushnir]

Description

Sometimes it's a bit unclear that a particular API is deprecated, for example take a look at the "entryComponents" at https://angular.io/api/core/NgModule. It'd be great to highlight deprecated APIs as such a bit more. Here are some ideas:

• on the summary list we can add a "deprecated" label/tag and also strikethrough the name:

• on a method/property details section we can do the same:

Also for some reasons the deprecation message itself is missing as well (see the message at https://github.com/angular/angular/blob/master/packages/core/src/metadata/ng_module.ts#L200-L203).

What is the affected URL?

https://angular.io/api/core/NgModule

[alan-agius4]

I like what @AndrewKushnir is proposing here, especially making the deprecated text a bit more prominent.

In the CLI MAN pages https://angular.io/cli/update something similar is displayed but the deprecated text isn't as prominent.

[angular-robot]

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