Document that pixel history events show up in the timeline bar

docs/Windows/TimelineBar.aml

@@ -74,6 +74,17 @@
         <mediaLink>
 <caption placement="after" lead="Resource Usage">The usage bar showing reads and writes to a texture.</caption>
 <image xlink:href="ResourceUsage"/>
+</mediaLink>
+      </content>
+    </section>
+    <section address="pixelhistory">
+      <title>Pixel history event Display</title>
+      <content>
+        <para>When a pixel history window is focussed, the timeline bar will show the results over each EID
+        with a red triangle to show rejected pixels and green triangles to show passed pixels.</para>
+        <mediaLink>
+<caption placement="after" lead="Pixel History Results">The timeline bar shows the results of a pixel's history.</caption>
+<image xlink:href="PixelHistoryTimeline"/>
 </mediaLink>
       </content>
     </section>

docs/renderdoc.shfbproj

@@ -121,6 +121,12 @@
     <Tokens Include="Tokens.tokens" />
   </ItemGroup>
   <ItemGroup>
+    <Image Include="imgs\Screenshots\PixelHistoryTimeline.png">
+      <ImageId>PixelHistoryTimeline</ImageId>
+      <AlternateText>Pixel History Timeline</AlternateText>
+      <AlternateText>Pixel history events displayed in timeline bar</AlternateText>
+      <ImageId>PixelHistoryTimeline</ImageId>
+    </Image>
     <Image Include="imgs\Screenshots\BookmarksBar.png">
       <ImageId>BookmarksBar</ImageId>
       <AlternateText>Bookmarks Bar</AlternateText>