minor symfony#20035 Add mentions where to find configCache (sukhoy94)

This PR was submitted for the 7.1 branch but it was squashed and merged into the 6.4 branch instead.

Discussion
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Add mentions where to find configCache

Added mention where to find ConfigCache class. To be used in  $containerCache->write()

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Commits
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cf5532d Add mentions where to find configCache

Author: javiereguiluz

components/dependency_injection/compilation.rst

@@ -504,7 +504,8 @@ serves at dumping the compiled container::
     The ``file_put_contents()`` function is not atomic. That could cause issues
     in a production environment with multiple concurrent requests. Instead, use
     the :ref:`dumpFile() method <filesystem-dumpfile>` from Symfony Filesystem
-    component or other methods provided by Symfony (e.g. ``$containerConfigCache->write()``)
+    component or other methods provided by Symfony (e.g. ``$containerConfigCache->write()``
+    which is part of the :doc:`Config component </components/config>`)
     which are atomic.
 
 ``ProjectServiceContainer`` is the default name given to the dumped container