Add RenderDiagnosticsPlugin to diagnostics example (#16741)

Improve the example.

Co-authored-by: Alice Cecile <[email protected]>

examples/diagnostics/log_diagnostics.rs

@@ -15,10 +15,15 @@ fn main() {
             LogDiagnosticsPlugin::default(),
             // Any plugin can register diagnostics. Uncomment this to add an entity count diagnostics:
             // bevy::diagnostic::EntityCountDiagnosticsPlugin::default(),
+
             // Uncomment this to add an asset count diagnostics:
             // bevy::asset::diagnostic::AssetCountDiagnosticsPlugin::<Texture>::default(),
+
             // Uncomment this to add system info diagnostics:
             // bevy::diagnostic::SystemInformationDiagnosticsPlugin::default()
+
+            // Uncomment this to add rendering diagnostics:
+            // bevy::render::diagnostic::RenderDiagnosticsPlugin::default(),
         ))
         .run();
 }