Update doc for dependencies injection and Symfony 7 (#559)

* doc for dependencies injection and symfony 7

* apply review

* Update Resources/doc/index.rst

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Co-authored-by: Alexander M. Turek <[email protected]>

Author: MrYamous

Resources/doc/index.rst

@@ -297,6 +297,11 @@ Here is an example on how to inject the service container into your migrations:
     this bundle will automatically inject the default symfony container into your migration class
     (this because the ``MigrationFactoryDecorator`` shown in this example is the default migration factory used by this bundle).
 
+.. caution::
+
+    The interface ``Symfony\Component\DependencyInjection\ContainerAwareInterface`` has been deprecated in Symfony 6.4 and
+    removed in 7.0. If you use this version or newer, there is currently no way to inject the service container into migrations.
+
 
 Generating Migrations Automatically
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