DOCG-4353 Mipmap streaming debug views and improvements

- Add new mipmap streaming debug views to Rendering Debugger documentation
- Improve mipmap streaming section in docs

Jira ticket: https://jira.unity3d.com/browse/DOCG-4353

Author: markg-unity

Packages/com.unity.render-pipelines.high-definition/Documentation~/rendering-debugger-window-reference.md

@@ -203,7 +203,9 @@
       * [Perform a full screen blit in URP in Compatibility mode](renderer-features/how-to-fullscreen-blit.md)
 * [Optimization](urp-optimization.md)
   * [Rendering Debugger](features/rendering-debugger.md)
-  * [Add controls to the Rendering Debugger](features/rendering-debugger-add-controls.md)
+    * [Use the Rendering Debugger](features/rendering-debugger-use.md)
+    * [Add controls to the Rendering Debugger](features/rendering-debugger-add-controls.md)
+    * [Rendering Debugger reference](features/rendering-debugger-reference.md)
   * [Optimize for better performance](optimize-for-better-performance.md)
   * [Reduce rendering work on the CPU](reduce-rendering-work-on-cpu.md)
     * [Use the GPU Resident Drawer](gpu-resident-drawer.md)