docs(@schematics/angular): remove hidden schematics from readme

Universal and E2E schematics are hidden/private.

Author: alan-agius4

packages/schematics/angular/README.md

@@ -12,7 +12,6 @@ application | Generates a new basic app definition in the "projects" subfolder o
 class | Creates a new, generic class definition in the given or default project
 component | Creates a new, generic component definition in the given or default project
 directive | Creates a new, generic directive definition in the given or default project
-e2e | Generates a new, generic end-to-end test definition for the given or default project
 enum | Generates a new, generic enum definition for the given or default project
 guard | Generates a new, generic route guard definition in the given or default project
 interceptor | Creates a new, generic interceptor definition in the given or default project
@@ -24,10 +23,9 @@ pipe | Creates a new, generic pipe definition in the given or default project
 resolver | Creates a new, generic resolver definition in the given or default project
 service | Creates a new, generic service definition in the given or default project
 service-worker | Pass this schematic to the "run" command to create a service worker
-universal | Pass this schematic to the "run" command to set up server-side rendering for an app
 web-worker | Creates a new, generic web worker definition in the given or default project
 workspace | Initializes an empty workspace and adds the necessary dependencies required by an Angular application
 
 ## Disclaimer
 
-While the schematics when executed via the Angular CLI and their associated options are considered stable, the programmatic APIs are not considered officially supported and are not subject to the breaking change guarantees of SemVer.
+While the schematics when executed via the Angular CLI and their associated options are considered stable, the programmatic APIs are not considered officially supported and are not subject to the breaking change guarantees of SemVer.