use consistent naming in renderdemo

samples/RenderDemo/MainWindow.xaml

@@ -44,8 +44,8 @@
       <TabItem Header="GlyphRun">
         <pages:GlyphRunPage/>
       </TabItem>
-      <TabItem Header="LineBoundsDemo">
-        <pages:LineBoundsDemo />
+      <TabItem Header="LineBounds">
+        <pages:LineBoundsPage />
       </TabItem>
     </TabControl>
   </DockPanel>

samples/RenderDemo/Pages/LineBoundsDemo.xaml → samples/RenderDemo/Pages/LineBoundsPage.xaml

@@ -4,6 +4,6 @@
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
              mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
              xmlns:controls="clr-namespace:RenderDemo.Controls"
-             x:Class="RenderDemo.Pages.LineBoundsDemo">
+             x:Class="RenderDemo.Pages.LineBoundsPage">
   <controls:LineBoundsDemoControl />
 </UserControl>

samples/RenderDemo/Pages/LineBoundsDemo.xaml.cs → samples/RenderDemo/Pages/LineBoundsPage.xaml.cs

@@ -4,9 +4,9 @@ using Avalonia.Markup.Xaml;
 
 namespace RenderDemo.Pages
 {
-    public class LineBoundsDemo : UserControl
+    public class LineBoundsPage : UserControl
     {
-        public LineBoundsDemo()
+        public LineBoundsPage()
         {
             this.InitializeComponent();
         }