remove old docs file

docs/how_to_use_prefixed_service_in_custom_rule.md

@@ -1,41 +0,0 @@
-# How to Use Prefixed Service In Custom Rule
-
-Since `rector/rector` version 0.11, it is not possible to use service that previously not prefixed in previous version, for example, you have the following custom rector rule with `Symplify\PackageBuilder\Strings\StringFormatConverter` dependency:
-
-```php
-use Symplify\PackageBuilder\Strings\StringFormatConverter;
-
-final class UnderscoreToCamelCaseVariableNameRector extends AbstractRector
-{
-    public function __construct(StringFormatConverter $stringFormatter)
-    {
-        // ...
-    }
-}
-```
-
-For above example, the `Symplify\PackageBuilder\Strings\StringFormatConverter` is no longer exists, you can consume via require --dev it:
-
-```bash
-composer require --dev symplify/package-builder
-```
-
-After that, you need to register the `symplify/package-builder`'s src to service in `rector.php`:
-
-```php
-<?php
-// rector.php
-
-use Symplify\PackageBuilder\Strings\StringFormatConverter;
-
-return static function (ContainerConfigurator $containerConfigurator): void {
-    // ...
-
-	$services = $containerConfigurator->services();
-	$services->set(StringFormatConverter::class);
-
-    // ...
-};
-```
-
-Now, the `Symplify\PackageBuilder\Strings\StringFormatConverter` service will be detected again.