MAUI-3771 : Update the codes in KB and UG samples - .NET MAUI ListView#4

SujaVenkatesan wants to merge 3 commits intoSyncfusionExamples:mainSyncfusionExamples/how-to-change-selected-item-image-in-.net-maui-listview:mainfrom

SujaVenkatesan:sample_changedSujaVenkatesan/how-to-change-selected-item-image-in-.net-maui-listview:sample_changedCopy head branch name to clipboard