WPF-62008 Correct inaccurate or outdated code samples and Code snippet#434

prakashperumal1892 merged 1 commit intohotfix/hotfix-v20.3.0.56syncfusion-content/wpf-docs:hotfix/hotfix-v20.3.0.56from

WPF-62008StencilUGCorrectionsyncfusion-content/wpf-docs:WPF-62008StencilUGCorrectionCopy head branch name to clipboard