Rename 3D editor debug draw modes to be more explicit

- Rename "Directional Shadow" to "Directional Shadow Map"
  to distinguish it from the "Directional Shadow Splits" option.
- Rename "Disable LOD" to "Disable Mesh LOD" as it only affects
  automatic mesh LOD, not visibility ranges.
- Rename "GI Buffer" to "VoxelGI/SDFGI Buffer" as it doesn't cover
  LightmapGI or SSIL.
- Rename the cluster options to match the respective node names.

editor/plugins/node_3d_editor_plugin.cpp

@@ -4383,7 +4383,7 @@ Node3DEditorViewport::Node3DEditorViewport(Node3DEditor *p_spatial_editor, Edito
 	display_submenu->add_radio_check_item(TTR("Normal Buffer"), VIEW_DISPLAY_NORMAL_BUFFER);
 	display_submenu->add_separator();
 	display_submenu->add_radio_check_item(TTR("Shadow Atlas"), VIEW_DISPLAY_DEBUG_SHADOW_ATLAS);
-	display_submenu->add_radio_check_item(TTR("Directional Shadow"), VIEW_DISPLAY_DEBUG_DIRECTIONAL_SHADOW_ATLAS);
+	display_submenu->add_radio_check_item(TTR("Directional Shadow Map"), VIEW_DISPLAY_DEBUG_DIRECTIONAL_SHADOW_ATLAS);
 	display_submenu->add_separator();
 	display_submenu->add_radio_check_item(TTR("Decal Atlas"), VIEW_DISPLAY_DEBUG_DECAL_ATLAS);
 	display_submenu->add_separator();
@@ -4399,14 +4399,14 @@ Node3DEditorViewport::Node3DEditorViewport(Node3DEditor *p_spatial_editor, Edito
 	display_submenu->add_radio_check_item(TTR("SSAO"), VIEW_DISPLAY_DEBUG_SSAO);
 	display_submenu->add_radio_check_item(TTR("SSIL"), VIEW_DISPLAY_DEBUG_SSIL);
 	display_submenu->add_separator();
-	display_submenu->add_radio_check_item(TTR("GI Buffer"), VIEW_DISPLAY_DEBUG_GI_BUFFER);
+	display_submenu->add_radio_check_item(TTR("VoxelGI/SDFGI Buffer"), VIEW_DISPLAY_DEBUG_GI_BUFFER);
 	display_submenu->add_separator();
-	display_submenu->add_radio_check_item(TTR("Disable LOD"), VIEW_DISPLAY_DEBUG_DISABLE_LOD);
+	display_submenu->add_radio_check_item(TTR("Disable Mesh LOD"), VIEW_DISPLAY_DEBUG_DISABLE_LOD);
 	display_submenu->add_separator();
-	display_submenu->add_radio_check_item(TTR("Omni Light Cluster"), VIEW_DISPLAY_DEBUG_CLUSTER_OMNI_LIGHTS);
-	display_submenu->add_radio_check_item(TTR("Spot Light Cluster"), VIEW_DISPLAY_DEBUG_CLUSTER_SPOT_LIGHTS);
+	display_submenu->add_radio_check_item(TTR("OmniLight3D Cluster"), VIEW_DISPLAY_DEBUG_CLUSTER_OMNI_LIGHTS);
+	display_submenu->add_radio_check_item(TTR("SpotLight3D Cluster"), VIEW_DISPLAY_DEBUG_CLUSTER_SPOT_LIGHTS);
 	display_submenu->add_radio_check_item(TTR("Decal Cluster"), VIEW_DISPLAY_DEBUG_CLUSTER_DECALS);
-	display_submenu->add_radio_check_item(TTR("Reflection Probe Cluster"), VIEW_DISPLAY_DEBUG_CLUSTER_REFLECTION_PROBES);
+	display_submenu->add_radio_check_item(TTR("ReflectionProbe Cluster"), VIEW_DISPLAY_DEBUG_CLUSTER_REFLECTION_PROBES);
 	display_submenu->add_radio_check_item(TTR("Occlusion Culling Buffer"), VIEW_DISPLAY_DEBUG_OCCLUDERS);
 
 	display_submenu->set_name("display_advanced");