[ErrorCatcher] some cleanup and better doc

Author: Tobion

Resources/config/debug_prod.xml

@@ -22,7 +22,7 @@
             <argument type="service" id="debug.file_link_formatter" />
             <argument>%kernel.debug%</argument>
             <argument>%kernel.charset%</argument>
-            <argument type="service" id="error_handler.error_renderer" on-invalid="null" />
+            <argument type="service" id="error_catcher.error_formatter" on-invalid="null" />
         </service>
 
         <service id="debug.file_link_formatter" class="Symfony\Component\HttpKernel\Debug\FileLinkFormatter">

Resources/config/error_catcher.xml

@@ -5,7 +5,7 @@
            xsi:schemaLocation="http://symfony.com/schema/dic/services https://symfony.com/schema/dic/services/services-1.0.xsd">
 
     <services>
-        <service id="error_catcher.error_renderer" class="Symfony\Component\ErrorCatcher\DependencyInjection\ErrorRenderer">
+        <service id="error_catcher.error_formatter" class="Symfony\Component\ErrorCatcher\DependencyInjection\LazyLoadingErrorFormatter">
             <argument /> <!-- error renderer locator -->
         </service>