Updating doc to set correct expectations when using restrictive XAML mode in WPF - #2278

Updating doc to set correct expectations when using restrictive XAML mode in WPF#2278

dipeshmsft wants to merge 3 commits into

maindotnet/docs-desktop:mainfrom

user/dipesh/restrictivexamlreader-doc-updatedotnet/docs-desktop:user/dipesh/restrictivexamlreader-doc-updateCopy head branch name to clipboard