chore(upgrade_to_32): Add OCP\TaskProcessing\Manager::getAvailableTaskTypeIds to app developer upgrade guide

Signed-off-by: Marcel Klehr <mklehr@gmx.net>

Author: marcelklehr

developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_32.rst

@@ -125,7 +125,7 @@ Added APIs
 
   - New task processing task type ``OCP\TaskProcessing\TextToSpeech`` to convert text to speech.
   - New task processing task type ``OCP\TaskProcessing\AnalyzeImages`` to ask questions about images.
-
+  - New method ``OCP\TaskProcessing\Manager::getAvailableTaskTypeIds`` to list only task type IDs without meta-data (faster than ``OCP\TaskProcessing\Manager::getAvailableTaskTypes``)
 
 Changed APIs
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