Fix typos: remove duplicate words in comments and documentation (#1871)

* Fix typo: remove duplicate "the" in BusyVerticalAlignment documentation

* Fix typo: remove duplicate "now" in window positioning comment

* Fix typo: remove duplicate "is" in app.manifest comment

* Fix: correct typo in comment - "selected" to "select"

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

QuickLook/Controls/BusyDecorator/BusyDecorator.cs

@@ -239,7 +239,7 @@ public class BusyDecorator : Decorator, IDisposable
         new FrameworkPropertyMetadata(VerticalAlignment.Center));
 
     /// <summary>
-    /// Gets or sets the the VerticalAlignment to use to layout the control that contains the busy indicator.
+    /// Gets or sets the VerticalAlignment to use to layout the control that contains the busy indicator.
     /// </summary>
     public VerticalAlignment BusyVerticalAlignment
     {

QuickLook/ViewerWindow.Actions.cs

@@ -64,7 +64,7 @@ public partial class ViewerWindow
 
     private void PositionWindow(Size size)
     {
-        // If the window is now now maximized, do not move it
+        // If the window is now maximized, do not move it
         if (WindowState == WindowState.Maximized)
             return;
 

QuickLook/app.manifest

@@ -25,8 +25,8 @@
   <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
     <application>
       <!-- A list of the Windows versions that this application has been tested on and is
-           is designed to work with. Uncomment the appropriate elements and Windows will 
-           automatically selected the most compatible environment. -->
+           designed to work with. Uncomment the appropriate elements and Windows will
+           automatically select the most compatible environment. -->
 
       <!-- Windows Vista -->
       <supportedOS Id="{e2011457-1546-43c5-a5fe-008deee3d3f0}" />