Fix guards for MarkdownTextBlock link clicking only on Windows platforms

Author: michael-hawker

common/CommunityToolkit.Labs.Shared/Renderers/ToolkitDocumentationRenderer.xaml

@@ -17,7 +17,7 @@
         <DataTemplate x:Key="DocumentTemplate"
                       x:DataType="x:String">
             <renderer:MarkdownTextBlock Background="Transparent"
-                                        LinkClicked="MarkdownTextBlock_LinkClicked"
+                                        win:LinkClicked="MarkdownTextBlock_LinkClicked"
                                         Text="{Binding}"
                                         TextWrapping="WrapWholeWords" />
         </DataTemplate>

common/CommunityToolkit.Labs.Shared/Renderers/ToolkitDocumentationRenderer.xaml.cs

@@ -7,11 +7,13 @@
 using Windows.Storage;
 using Windows.System;
 
+#if !HAS_UNO
 #if !WINAPPSDK
 using Microsoft.Toolkit.Uwp.UI.Controls;
 #else
 using CommunityToolkit.WinUI.UI.Controls;
 #endif
+#endif
 
 namespace CommunityToolkit.Labs.Shared.Renderers;
 
@@ -186,6 +188,7 @@ private static async Task<string> GetDocumentationFileContents(ToolkitFrontMatte
         }
     }
 
+#if !HAS_UNO
     private async void MarkdownTextBlock_LinkClicked(object sender, LinkClickedEventArgs e)
     {
         if (!Uri.IsWellFormedUriString(e.Link, UriKind.Absolute))
@@ -203,4 +206,5 @@ private async void MarkdownTextBlock_LinkClicked(object sender, LinkClickedEvent
             await Launcher.LaunchUriAsync(new Uri(e.Link));
         }
     }
+#endif
 }