docs: update CLI related deprecation information (#47885)

There are no new CLI related deprecations for v15. However, multiple
features listed in the deprecation guide have since been removed and
are now also removed from the relevant sections of the guide.

PR Close #47885

aio/content/guide/deprecations.md

@@ -598,29 +598,13 @@ mockRequest.error(mockError);
 
 This section contains a complete list all of the currently deprecated CLI flags.
 
-### @angular/cli
-
-| API/Option        | May be removed in | Details |
-|:---               |:---               |:---     |
-| `--prod`          | <!--v12--> v14    | Use `--configuration production` instead. |
-| `ng update --all` | <!--v11--> v14    | No longer has an effect.                  |
-
 ### &commat;angular-devkit/build-angular
 
 | API/Option                 | May be removed in | Details |
 |:---                        |:---               |:---     |
 | `deployUrl`                | <!--v13--> v15    | Use `baseHref` option, `APP_BASE_HREF` DI token or a combination of both instead. For more information, see [the deploy url](guide/deployment#the-deploy-url). |
-| `showCircularDependencies` | <!--v12--> v14    | The recommended method to detect circular dependencies in project code is to use either a lint rule or other external tooling.                                 |
 | Protractor builder         | <!--v12--> v14    | Deprecate as part of the Protractor deprecation.                                                                                                               |
 
-### &commat;angular-devkit/build-optimizer
-
-The entire NPM package is deprecated.
-It has always been experimental \(never hit `1.0.0`\) and has
-been an internal package for the Angular CLI.
-All the relevant functionality has been moved to
-`@angular-devkit/build-angular`
-
 <a id="removed"></a>
 
 ## Removed APIs