[DependencyInjection] Roll back changes made to generated files.

Original change was made in e9022adaef40330a92bdf0916bf0b995f942c7fa.
Fixed self-reference in 'service_container' service breaks garbage collection (and clone).
fix some docblocks
minor #11483 fix some docblocks (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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fix some docblocks

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Commits
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1775da5 fix some docblocks
[DependencyInjection] fixed missing 'factory-class' attribute in XmlDumper output

Symfony\Component\DependencyInjection\Dumper\XmlDumper didn't write 'factory-class' XML attribute for definitions on which setFactoryClass() was called.

This caused the Container[Builder] to throw an exception when the relevant service is being requested/initiated after loading the dumped XML:

`Uncaught Exception Symfony\Component\DependencyInjection\Exception\RuntimeException: "Cannot create service "xxx" from factory method without a factory service or factory class." at /<path>/<to>/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php`

Fixed the problem, and updated the relevant test fixture.
[DependencyInjection] fix @return anno created by PhpDumper
Fixed Factory services not within the ServiceReferenceGraph.