+ explain decorators and how they are implemented in angular
+ explain how different types of services can be selected
+ explain `$delegate` objects and how they differ between services
+ warn of the risks/caveats of `$delegate` modification
+ note the exposure of `decorator` through the module api
+ show an example of decorating a core service
+ show an example of decorating a core directive
+ show an example of decorating a core filter
Closes#12163Closes#14372
Stephen Barker
938bd45626