[BUGFIX] Fix migration example for GeneralUtility::_GPmerged()

The migration example code is wrong, since the request
object has no method named `getQueryString()`. Instead,
`getQueryParams()` must be used.

Resolves: #100061
Releases: main
Signed-off-by: Torben Hansen <derhansen@gmail.com>
Change-Id: Iacda918b4f72647255560c4a983cd9b7099a032a
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78001


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Thomas Hohn <tho@gyldendal.dk>
Tested-by: Thomas Hohn <tho@gyldendal.dk>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>

typo3/sysext/core/Documentation/Changelog/12.2/Deprecation-99615-GeneralUtilityGPMerged.rst

@@ -61,7 +61,7 @@ Typical code:
     $getMergedWithPost = GeneralUtility::_GPmerged('tx_scheduler');
 
     // After
-    $getMergedWithPost = $request->getQueryString()['tx_scheduler'];
+    $getMergedWithPost = $request->getQueryParams()['tx_scheduler'];
     ArrayUtility::mergeRecursiveWithOverrule($getMergedWithPost, $request->getParsedBody()['tx_scheduler']);
 
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