docs: document adding of argument

Signed-off-by: Jana Peper <jana.peper@nextcloud.com>

lib/public/TaskProcessing/IManager.php

@@ -49,6 +49,7 @@ interface IManager {
 	 * @param bool $showDisabled if false, disabled task types will be filtered
 	 * @return array<string, array{name: string, description: string, inputShape: ShapeDescriptor[], inputShapeEnumValues: ShapeEnumValue[][], inputShapeDefaults: array<array-key, numeric|string>, optionalInputShape: ShapeDescriptor[], optionalInputShapeEnumValues: ShapeEnumValue[][], optionalInputShapeDefaults: array<array-key, numeric|string>, outputShape: ShapeDescriptor[], outputShapeEnumValues: ShapeEnumValue[][], optionalOutputShape: ShapeDescriptor[], optionalOutputShapeEnumValues: ShapeEnumValue[][]}>
 	 * @since 30.0.0
+	 * @since 31.0.0 Added the `showDisabled` argument.
 	 */
 	public function getAvailableTaskTypes(bool $showDisabled = false): array;