minor #10070 Remove example of register a service where its id match to its class (l-vo)

This PR was merged into the 3.4 branch.

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

`ResolveClassPass` which resolve service definitions where class match to the service id is one of the first compiler pass processed (priority 100 in beforeOptimizationPasses phase). When adding a custom compiler pass, it is by default added to the beforeOptimizationPasses but with the default priority of 0. So the `ResolveClassPass` has already been executed and our custom service definition class isn't resolved.

Commits
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4905190 Remove example of register a service where its id match to its class

Author: javiereguiluz

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
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