Address code review comments

- Changed Task.Wait() to task.GetAwaiter().GetResult() to avoid deadlocks
- Added named constant for killEntireProcessTree parameter
- Added clarifying comment for FakeInput creation
- Added comment explaining relative path construction for Examples directory

Co-authored-by: tig <585482+tig@users.noreply.github.com>

Terminal.Gui/Examples/ExampleRunner.cs

@@ -71,7 +71,7 @@ public static class ExampleRunner
             // If entry point returns Task, wait for it
             if (result is Task task)
             {
-                task.Wait ();
+                task.GetAwaiter ().GetResult ();
             }
 
             return new ()
@@ -126,7 +126,8 @@ public static class ExampleRunner
         {
             try
             {
-                process.Kill (true);
+                const bool killEntireProcessTree = true;
+                process.Kill (killEntireProcessTree);
             }
             catch
             {