[DOCS] Fix broken cross reference to changelog entry

The reference to 85829 was broken.
It linked to 9.5 while the actual change was made in 9.4.
Therefore the link is adjusted to link to the actual existing file.

We use the :doc: syntax to allow sphinx to properly build the URL from
relative file path.

Resolves: #93641
Releases: master, 10.4, 9.5
Change-Id: Ia7755110b67ee4ff2efd3755cc5037d1f8e35f29
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68181


Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>

typo3/sysext/core/Documentation/Changelog/9.5/Deprecation-86068-OldConditionSyntax.rst

@@ -12,7 +12,7 @@ Description
 The Symfony expression language is available for TypoScript since :issue:`85829` has been merged.
 Accordingly the classic TypoScript condition syntax has been marked as deprecated.
 
-For detailed information about the new expression language see `#85829 <Feature-85829-ImplementSymfonyExpressionLanguageForTypoScriptConditions.rst>`_.
+For detailed information about the new expression language see :doc:`#85829 <../9.4/Feature-85829-ImplementSymfonyExpressionLanguageForTypoScriptConditions>`.
 
 
 Impact