…jection over Container. Includes changes from PR symfony#8985

… javiereguiluz)

This PR was merged into the 4.0 branch.

Discussion
----------

Removed invalid examples

Templating isn't a service in Symfony 4+ (even after `composer req templating`), so probably we're looking for the twig service.

The Router service isn't public and can therefor not be called from the container:
```
$ php bin/console debug:container router

 // This service is an alias for the service router.default

Information for Service "router.default"
========================================

 ---------------- -----------------------------------------------
  Option           Value
 ---------------- -----------------------------------------------
  Service ID       router.default
  Class            Symfony\Bundle\FrameworkBundle\Routing\Router
  Tags             -
  Calls            setConfigCacheFactory
  Public           no
  Synthetic        no
  Lazy             no
  Shared           yes
  Abstract         no
  Autowired        no
  Autoconfigured   no
 ---------------- -----------------------------------------------
```

Commits
-------

3492028 Use controller method injection instead of the constructor
f9091b0 Updated documentation to reflect best practice of using Dependency Injection over Container. Includes changes from PR #8985
18e6d9e Removed "Accessing the Container Directly"
89e38ef Removed invalid examples

* 4.0:
  Update collection.rst
  Mention that PSR-1 doesn't recommend CamelCase or anything else
  Fixed the XML and PHP config instead of the YAML config
  Use controller method injection instead of the constructor
  Add missing references
  Updated documentation to reflect best practice of using Dependency Injection over Container. Includes changes from PR symfony#8985
  Removed "Accessing the Container Directly"
  minor symfony#8091 Update js-datepicker usage for new jQuery UI (AdrianBorodziuk, javiereguiluz)
  minor symfony#8983 cross-reference console command testing from testing guide (dbu)
  Fix YAML config bug
  Removed invalid examples
  commands are automatically registered in symfony full stack
  update forms.rst