Remove example of register a service where its id match to its class

Author: l-vo

service_container/definitions.rst

@@ -38,9 +38,6 @@ There are some helpful methods for working with the service definitions::
     // shortcut for the previous method
     $container->register('app.number_generator', \AppBundle\NumberGenerator::class);
 
-    // or create a service whose id matches its class
-    $container->register(\AppBundle\NumberGenerator::class);
-
 Working with a Definition
 -------------------------