minor symfony#15789 [Cache] Document deprecation of Doctrine Cache (derrabus)

This PR was merged into the 5.4 branch.

Discussion
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[Cache] Document deprecation of Doctrine Cache

Fixes symfony#15788

Commits
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552d9db Document deprecation of Doctrine Cache

Author: javiereguiluz

cache.rst

@@ -30,6 +30,11 @@ The following example shows a typical usage of the cache::
 Symfony supports Cache Contracts, PSR-6/16 and Doctrine Cache interfaces.
 You can read more about these at the :doc:`component documentation </components/cache>`.
 
+.. deprecated:: 5.4
+
+    Support for Doctrine Cache was deprecated in Symfony 5.4
+    and it will be removed in Symfony 6.0.
+
 .. _cache-configuration-with-frameworkbundle:
 
 Configuring Cache with FrameworkBundle

components/cache.rst

@@ -20,6 +20,11 @@ The Cache Component
     Doctrine caches. See :doc:`/components/cache/psr6_psr16_adapters` and
     :doc:`/components/cache/adapters/doctrine_adapter`.
 
+    .. deprecated:: 5.4
+
+        Support for Doctrine Cache was deprecated in Symfony 5.4
+        and it will be removed in Symfony 6.0.
+
 Installation
 ------------
 

components/cache/adapters/doctrine_adapter.rst

@@ -7,6 +7,11 @@
 Doctrine Cache Adapter
 ======================
 
+.. deprecated:: 5.4
+
+    The ``DoctrineAdapter`` and ``DoctrineProvider`` classes were deprecated in Symfony 5.4
+    and it will be removed in Symfony 6.0.
+
 This adapter wraps any class extending the `Doctrine Cache`_ abstract provider, allowing
 you to use these providers in your application as if they were Symfony Cache adapters.
 
@@ -39,9 +44,4 @@ third parameters::
     A :class:`Symfony\\Component\\Cache\\DoctrineProvider` class is also provided by the
     component to use any PSR6-compatible implementations with Doctrine-compatible classes.
 
-    .. deprecated:: 5.4
-
-        The ``DoctrineProvider`` class was deprecated in Symfony 5.4 and it will
-        be removed in Symfony 6.0.
-
 .. _`Doctrine Cache`: https://github.com/doctrine/cache