Add documentation for RenderMode enum variants

I was confused what VisualizeTraces actually did, so I added a comment
explaining what's actually for "Visualize Controls". Added documentation
for the other variants as well, even if they're obvious.

Author: redstrate

plugins/quickinspector/quickinspectorinterface.h

@@ -51,11 +51,17 @@ class QuickInspectorInterface : public QObject
 
     enum RenderMode
     {
+        ///< Nothing special is drawn.
         NormalRendering,
+        ///< Backs "Visualize Clipping" in the UI.
         VisualizeClipping,
+        ///< Backs "Visualize Overdraw" in the UI.
         VisualizeOverdraw,
+        ///< Backs "Visualize Batches" in the UI.
         VisualizeBatches,
+        ///< Backs "Visualize Changes" in the UI.
         VisualizeChanges,
+        ///< Backs "Visualize Controls" in the UI.
         VisualizeTraces,
     };