[TASK] Reference BeforeLoadedUserTsConfigEvent in "Setting user TScon…

…fig" chapter (#386)

Additionally, fix some wordings as drive-by.

Related: TYPO3-Documentation/Changelog-To-Doc#646
Releases: main

Documentation/UsingSetting/UserTSconfig.rst

@@ -57,15 +57,15 @@ Setting default user TSconfig
 =============================
 
 ..  versionadded:: 13.0
-    Starting with TYPO3 v12.0 page TSconfig in a file named
+    Starting with TYPO3 v13.0 user TSconfig in a file named
     :file:`Configuration/user.tsconfig` in an extension is automatically loaded
     during build time.
 
 User TSconfig is designed to be individual for users or groups of
 users. However, good defaults can be defined and overridden by group or
 user-specific TSconfig.
 
-Default page TSconfig should be stored within an extension, usually a
+Default user TSconfig should be stored within an extension, usually a
 sitepackage extension. The content of the file
 :file:`Configuration/user.tsconfig` within an extension is automatically loaded
 during build time.
@@ -78,6 +78,8 @@ this file:
 
     @import 'EXT:my_sitepackage/Configuration/TsConfig/User/default.tsconfig'
 
+The PSR-14 event :ref:`t3coreapi:BeforeLoadedUserTsConfigEvent` is available to
+add global static user TSconfig before anything else is loaded.
 
 User TSconfig, compatible with TYPO3 v12 and v13
 ------------------------------------------------