Update README.md

Author: ondrejmirtes

README.md

@@ -53,11 +53,11 @@ You have to provide a path to `srcDevDebugProjectContainer.xml` or similar XML f
 ```yaml
 parameters:
     symfony:
-        container_xml_path: %rootDir%/../../../var/cache/dev/srcDevDebugProjectContainer.xml
+        container_xml_path: var/cache/dev/srcDevDebugProjectContainer.xml
         # or with Symfony 4.2+
-        container_xml_path: '%rootDir%/../../../var/cache/dev/srcApp_KernelDevDebugContainer.xml'
+        container_xml_path: var/cache/dev/srcApp_KernelDevDebugContainer.xml
         # or with Symfony 5+
-        container_xml_path: '%rootDir%/../../../var/cache/dev/App_KernelDevDebugContainer.xml'
+        container_xml_path: var/cache/dev/App_KernelDevDebugContainer.xml
 ```
 
 ## Constant hassers