Destroy Pipeline and all ShaderModule

add markdown and put back Pipeline::Release()

as asked by rpavlik

Author: remmel

changes/sdk/pr.538.gh.OpenXR-SDK-Source.md

@@ -0,0 +1 @@
+> hello_xr: Fix Vulkan resource destruction bugs of ShaderProgram and Pipeline.

src/tests/hello_xr/graphicsplugin_vulkan.cpp

@@ -352,7 +352,7 @@ struct ShaderProgram {
         if (m_vkDevice != nullptr) {
             for (auto& si : shaderInfo) {
                 if (si.module != VK_NULL_HANDLE) {
-                    vkDestroyShaderModule(m_vkDevice, shaderInfo[0].module, nullptr);
+                    vkDestroyShaderModule(m_vkDevice, si.module, nullptr);
                 }
                 si.module = VK_NULL_HANDLE;
             }
@@ -881,6 +881,8 @@ struct Pipeline {
         m_vkDevice = nullptr;
     }
 
+    ~Pipeline() { Release(); }
+
    private:
     VkDevice m_vkDevice{VK_NULL_HANDLE};
 };