[DOCS] Correct code example in Changelog

Remove excess bracket

Releases: main, 12.4
Resolves: #103635
Change-Id: Ie9ea1f03457177eeb6be7abb788c05bd2bf64e8c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83832
Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Oliver Bartsch <bo@cedev.de>

Documentation/Changelog/12.4/Deprecation-100596-GeneralUtility_GET.rst

@@ -62,7 +62,7 @@ Typical code:
     $value = GeneralUtility::_GET('tx_scheduler');
 
     // After
-    $value = $request->getQueryParams()['tx_scheduler']) ?? null;
+    $value = $request->getQueryParams()['tx_scheduler'] ?? null;
 
 
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