Comment on Vulkan 1.1 and core feature

examples/negativeviewportheight/negativeviewportheight.cpp

@@ -68,6 +68,7 @@ public:
 		title = "Negative Viewport height";
 		settings.overlay = true;
 		// [POI] VK_KHR_MAINTENANCE1 is required for using negative viewport heights
+		// Note: This is core as of Vulkan 1.1. So if you target 1.1 you don't have to explicitly enable this
 		enabledDeviceExtensions.push_back(VK_KHR_MAINTENANCE1_EXTENSION_NAME);
 	}