[DOCS] Adjust Includes.rst.txt after switch to PHP-based rendering

Resolves: #103350
Related: #103304
Releases: main, 12.4, 11.5
Change-Id: I228f946b8bca26b5c334b352ecd48edfd72c620b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83360


Tested-by: core-ci <typo3@b13.com>
Tested-by: Lina Wolf <112@linawolf.de>
Reviewed-by: Lina Wolf <112@linawolf.de>
Tested-by: Garvin Hicking <gh@faktor-e.de>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>

typo3/sysext/indexed_search/Documentation/Includes.rst.txt

-.. More information about this file:
-   https://docs.typo3.org/m/typo3/docs-how-to-document/main/en-us/GeneralConventions/FileStructure.html#includes-rst-txt
-
-.. ----------
-.. text roles
-.. ----------
-
-.. role:: aspect(emphasis)
-.. role:: bash(code)
-.. role:: html(code)
-.. role:: js(code)
-.. role:: php(code)
-.. role:: rst(code)
-.. role:: sep(strong)
-.. role:: sql(code)
-
-.. role:: tsconfig(code)
-   :class: typoscript
-
-.. role:: typoscript(code)
-.. role:: xml(code)
-   :class: html
-
-.. role:: yaml(code)
-
-.. default-role:: code
-
-.. ---------
-.. highlight
-.. ---------
-
-.. By default, code blocks use PHP syntax highlighting
-
-.. highlight:: php
+..  You can put central messages to display on all pages here