Update README.adoc

Add new components

README.adoc

@@ -12,20 +12,20 @@ https://docs.vulkan.org/spec/latest/index.html.
 
 The site generator currently combines these components:
 
-* Vulkan Specification and proposals
-*
 
-link:https://github.com/KhronosGroup/Vulkan-Docs[Vulkan Specification and
-Proposal documents]; the
-link:https://github.com/KhronosGroup/Vulkan-Guide[Vulkan Guide], with more
-components expected to be added in the future.
+* link:https://github.com/KhronosGroup/Vulkan-Docs[Vulkan Specification and
+Proposals]
+* link:https://github.com/KhronosGroup/Vulkan-Guide[Vulkan Guide]
+* link:https://github.com/KhronosGroup/Vulkan-Samples[Vulkan Samples]
+* link:https://github.com/KhronosGroup/Vulkan-Tutorial[Vulkan Tutorial]
+* More components will be added in the future.
 
 This repository contains only the Antora "`playbook`" describing the various
 documentation components and how to integrate them, and related files needed
 to build the site using the playbook.
 
 Content for individual components comes from the repositories hosting those
-components.
+components, and issues with individual components should be reported in those repositories.
 
 
 == Files