WINUI-843320-Prepare the UG doument content for SfShimmer control in WinUI#661

GilbertmanojSF3971 wants to merge 5 commits intodevelopmentsyncfusion-content/winui-docs:developmentfrom

WINUI-843320-Prepare-the-UG-doument-content-for-SfShimmer-control-in-WinUIsyncfusion-content/winui-docs:WINUI-843320-Prepare-the-UG-doument-content-for-SfShimmer-control-in-WinUICopy head branch name to clipboard