docs($provide): add array annotation type to $provide.decorator parameter
docs($provide): add array annotation type to $provide.decorator parameter

The $provide.decorator function, as per the documentation, "is called using
the auto.injector.invoke method and is therefore fully injectable."

The current @param contradicts this by stating that only a functions may
be used as an argument.

Closes #11507

ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js