Clarify comment about compatibility with RenderDoc
diff --git a/src/VulkanSample.cpp b/src/VulkanSample.cpp
index 203bc09..94d8b12 100644
--- a/src/VulkanSample.cpp
+++ b/src/VulkanSample.cpp
@@ -1286,11 +1286,14 @@
     {

         /*

         Comment out this line to make the app working with RenderDoc.

+    

+        Currently there is a problem with compatibility of this app with RenderDoc due

+        to a known bug in Vulkan validation layers:

 

-        RenderDoc relies on pointers to Vulkan function being null or not null instead

-        of checking whether the app really uses Vulkan 1.0 or 1.1. This app uses Vulkan

-        1.0 and VK_KHR_dedicated_allocation extension instead of equivalent

-        functionality embedded into Vulkan 1.1.

+        https://github.com/KhronosGroup/Vulkan-ValidationLayers/issues/579

+

+        It occurs because this app uses Vulkan 1.0 and VK_KHR_dedicated_allocation

+        extension instead of equivalent functionality embedded into Vulkan 1.1.

         */

         allocatorInfo.flags |= VMA_ALLOCATOR_CREATE_KHR_DEDICATED_ALLOCATION_BIT;

     }