Update ExtTyposcriptConstantsTyposcript.rst

Documentation/ExtensionArchitecture/FileStructure/ExtTyposcriptConstantsTyposcript.rst

@@ -6,12 +6,17 @@
 :file:`ext_typoscript_constants.typoscript`
 ===========================================
 
-Preset TypoScript constants. Will be included in the setup section of all
-TypoScript templates.
+reset TypoScript constants. Will be included in the constants section of all
+TypoScript **records**. Takes no effect in sites using :ref:`Site sets <t3coreapi:site-sets>`.
 
-.. attention::
+..  attention::
 
-   Use such a file if you absolutely need to load some TypoScript (because you
-   would get serious errors without it). Otherwise static templates or
-   usage of the *Extension Management API* of class
-   :php:`TYPO3\CMS\Core\Utility\ExtensionManagementUtility` are preferred.
+    ..  versionchanged:: 13.1
+
+    This file takes no effect in sites that use :ref:`Site sets <t3coreapi:site-sets>`
+    This file works for backward compability reasons only in installations that depend
+    on TypoScript records only.
+
+    Provide settings in your :ref:`Site settings definitions <t3coreapi:site-settings-definition>` 
+    in your site set. TypoScript constants that have to be loaded globally
+    can be loaded via :ref:`ExtensionManagementUtility::addTypoScript <t3tsref:extdev-always-load>`.