Add a message about SRGBA -> RGBA conversion

src/video_core/renderer_opengl/gl_rasterizer_cache.h

@@ -200,6 +200,8 @@ struct SurfaceParams {
 
     static PixelFormat PixelFormatFromRenderTargetFormat(Tegra::RenderTargetFormat format) {
         switch (format) {
+        // TODO (Hexagon12): Converting SRGBA to RGBA is a hack and doesn't completely correct the
+        // gamma.
         case Tegra::RenderTargetFormat::RGBA8_SRGB:
         case Tegra::RenderTargetFormat::RGBA8_UNORM:
             return PixelFormat::ABGR8;