Update docs

docs/pages/factory_functions.md

@@ -13,7 +13,7 @@ inheriting from the same base (See: [Strategy Pattern](https://en.wikipedia.org/
 ## Usage
 
 In order for the container to inject these dependencies, you must register the factory function
-by using the `@service` decorator or by calling `container.register(fn)` directly.
+by using the `@service` decorator.
 
 When the container needs to inject a dependency, it checks known factories to see if any of them can create it.
 

docs/pages/services.md

@@ -5,10 +5,7 @@ Wireup does not enforce a code structure. Services may live anywhere in the appl
 be registered with the container. 
 Top-level modules containing registrations must also be declared in the `initialize_container` call.
 
-To register a class as a service you can use one of the following
-
-* Decorate the class with `@service`.
-* Call `container.register(YourService)` directly.
+To register a class as a service you can decorate it with `@service` or `@abstract`.
 
 ### Lifetime
 By default, the container will keep in memory only a single copy of each service.